Annual report pursuant to Section 13 and 15(d)

Nature Of Operations And Accounting Policies (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details)

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Nature Of Operations And Accounting Policies (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance $ 853,842 $ 753,361 $ 1,196,268
Discontinued Operations     (527,691)
Other comprehensive income (loss) (16) (391) 1,707
Income tax (expense) benefit (68) 22 (702)
Total equity, ending balance 812,514 853,842 753,361
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (914) (545) (11,593)
Discontinued Operations     10,031
Other comprehensive income (loss) (83) (391) 1,812
Income tax (expense) benefit (68) 22 (795)
Total equity, ending balance (1,065) (914) (545)
Derivative Gains (Losses) on Cash Flow Hedges, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 0 0 75
Discontinued Operations     94
Other comprehensive income (loss) 67 0 (260)
Income tax (expense) benefit 0 0 91
Total equity, ending balance 67 0 0
Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 0 0 4
Discontinued Operations     0
Other comprehensive income (loss) 0 0 (6)
Income tax (expense) benefit 0 0 2
Total equity, ending balance 0 0 0
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (914) (545) (11,514)
Discontinued Operations     10,125
Other comprehensive income (loss) (16) (391) 1,546
Income tax (expense) benefit (68) 22 (702)
Total equity, ending balance (998) (914) (545)
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 0 0 (1,613)
Discontinued Operations     1,460
Other comprehensive income (loss) 0 0 153
Income tax (expense) benefit 0 0 0
Total equity, ending balance 0 0 0
Derivative Losses on Cash Flow Hedges, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 0 0 (17)
Discontinued Operations     4
Other comprehensive income (loss) 0 0 13
Income tax (expense) benefit 0 0 0
Total equity, ending balance 0 0 0
Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 0 0 3
Discontinued Operations     2
Other comprehensive income (loss) 0 0 (5)
Income tax (expense) benefit 0 0 0
Total equity, ending balance 0 0 0
Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (369) 1,005  
Total equity, ending balance $ (84) $ (369) $ 1,005