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Shareholders' Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 356,082 $ 418,811  
Other comprehensive income (loss) 8,763 (3,344)  
Ending balance 366,070 411,811  
ASU 2016-01 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     $ 0
ASU 2018-02 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     0
Other Comprehensive Income (Loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (7,347) 46,391  
Other comprehensive income before reclassifications 7,978 (3,221)  
Amounts reclassified from accumulated other comprehensive income (loss) 785 (123)  
Other comprehensive income (loss) 8,763 (3,344)  
Ending balance 1,416 (2,993)  
Other Comprehensive Income (Loss) [Member] | ASU 2016-01 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     (46,157)
Adjusted beginning balance   234  
Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     117
Foreign Currency [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,139) (309)  
Other comprehensive income before reclassifications 307 (223)  
Amounts reclassified from accumulated other comprehensive income (loss) 0 0  
Other comprehensive income (loss) 307 (223)  
Ending balance (832) (532)  
Foreign Currency [Member] | ASU 2016-01 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     0
Adjusted beginning balance   (309)  
Foreign Currency [Member] | ASU 2018-02 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     0
Unrealized Holding Gains on Available-for-sale Securities [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6,208) 46,700  
Other comprehensive income before reclassifications 7,671 (2,998)  
Amounts reclassified from accumulated other comprehensive income (loss) 785 (123)  
Other comprehensive income (loss) 8,456 (3,121)  
Ending balance $ 2,248 (2,461)  
Unrealized Holding Gains on Available-for-sale Securities [Member] | ASU 2016-01 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     (46,157)
Adjusted beginning balance   $ 543  
Unrealized Holding Gains on Available-for-sale Securities [Member] | ASU 2018-02 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption, net of tax     $ 117