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Accumulated Other Comprehensive Income (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent [Roll Forward]  
Beginning Balance $ 79,292
Other comprehensive income before reclassification, net of income tax benefit of $2,416 23,500
Amounts reclassified from accumulated other comprehensive income
Net current-period other comprehensive income 23,500
Ending Balance 102,792
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Roll Forward]  
Beginning Balance (22,864)
Other comprehensive income before reclassification, net of income tax benefit of $2,416 (14,856)
Amounts reclassified from accumulated other comprehensive income (178)
Net current-period other comprehensive income (15,034)
Reclassification of tax effects due to adoption of ASU 2018-02 (452)
Ending Balance (38,350)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance 56,428
Other comprehensive income before reclassification, net of income tax benefit of $2,416 8,644
Amounts reclassified from accumulated other comprehensive income (178)
Net current-period other comprehensive income 8,466
Reclassification of tax effects due to adoption of ASU 2018-02 (452)
Ending Balance $ 64,442