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Changes In Accumulated Other Comprehensive Income (Loss) By Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 855,872 $ 553,902 $ 443,145
Ending balance 920,964 855,872 553,902
Reclassification adjustment from AOCI 8,800 (7,237) (85)
Unrealized gains (losses), available-for-sale securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,681) (4,602)  
Other comprehensive income (loss) before reclassifications 7,800 (1,872)  
Amounts reclassified from accumulated other comprehensive income to net income (5,368) 3,793  
Net current-period other comprehensive income 2,432 1,921  
Ending balance (249) (2,681) (4,602)
Foreign currency items, available-for-sale securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0 (584)  
Other comprehensive income (loss) before reclassifications 88 (146)  
Amounts reclassified from accumulated other comprehensive income to net income 0 730  
Net current-period other comprehensive income 88 584  
Ending balance 88 0 (584)
Total unrealized gains (losses), available-for-sale securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,681) (5,186)  
Other comprehensive income (loss) before reclassifications 7,888 (2,018)  
Amounts reclassified from accumulated other comprehensive income to net income (5,368) 4,523  
Net current-period other comprehensive income 2,520 2,505  
Ending balance (161) (2,681) (5,186)
Unrealized loss on cash flow hedge      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,211) (2,798)  
Other comprehensive income (loss) before reclassifications 406 (629)  
Amounts reclassified from accumulated other comprehensive income to net income 1,607 1,216  
Net current-period other comprehensive income 2,013 587  
Ending balance (198) (2,211) (2,798)
Accumulated other comprehensive income (loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (4,892) (7,984) (122)
Other comprehensive income (loss) before reclassifications 8,294 (2,647)  
Amounts reclassified from accumulated other comprehensive income to net income (3,761) 5,739  
Net current-period other comprehensive income 4,533 3,092  
Ending balance (359) (4,892) $ (7,984)
Gain on Investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Reclassification adjustment from AOCI 8,800 25  
Reclassification adjustment from AOCI, net $ 5,400 16  
Impairment Loss on Investment Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Reclassification adjustment from AOCI   7,300  
Reclassification adjustment from AOCI, net   $ 4,500