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, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance $ 812,514 $ 853,842 $ 753,361
Other comprehensive income (loss) (1,151) (16) (391)
Income tax (expense) benefit 1 (68) 22
Total equity, ending balance 845,417 812,514 853,842
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (1,065) (914) (545)
Other comprehensive income (loss) (194) (83) (391)
Income tax (expense) benefit 1 (68) 22
Total equity, ending balance (1,258) (1,065) (914)
Derivative Gains (Losses) on Cash Flow Hedges, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance 67 0 0
Other comprehensive income (loss) (957) 67 0
Income tax (expense) benefit 0 0 0
Total equity, ending balance (890) 67 0
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (998) (914) (545)
Other comprehensive income (loss) (1,151) (16) (391)
Income tax (expense) benefit 1 (68) 22
Total equity, ending balance (2,148) (998) (914)
Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total equity, beginning balance (84) (369)  
Total equity, ending balance $ (1,150) $ (84) $ (369)