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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 1,149,428 $ 1,146,265
Ending balance 1,165,771 1,085,750
Net unrealized gain (loss) on available-for-sale securities, tax provision (benefit) 100 (100)
Net Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 115,873 139,356
Other comprehensive income (loss) before reclassifications 2,930 (10,103)
Amounts reclassified from other accumulated comprehensive income (3,928) (10,953)
Net current-period other comprehensive income (loss) (998) (21,056)
Ending balance 114,875 118,300
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (44,020) (47,363)
Other comprehensive income (loss) before reclassifications 1,733 (14,243)
Amounts reclassified from other accumulated comprehensive income 14 18
Net current-period other comprehensive income (loss) 1,747 (14,225)
Ending balance $ (42,273) $ (61,588)