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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     $ 1,149,428 $ 1,146,265
Ending balance $ 1,179,424 $ 1,092,603 1,179,424 1,092,603
Net unrealized gain (loss) on available-for-sale securities, tax benefit (provision) 100 300 (100) 400
Net Unrealized Gains on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 114,875 118,300 115,873 139,356
Other comprehensive income (loss) before reclassifications 1,811 6,260 4,741 (3,843)
Amounts reclassified from other accumulated comprehensive income (2,322) (7,711) (6,250) (18,664)
Net current-period other comprehensive income (loss) (511) (1,451) (1,509) (22,507)
Ending balance 114,364 116,849 114,364 116,849
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (42,273) (61,588) (44,020) (47,363)
Other comprehensive income (loss) before reclassifications (2,429) (8,949) (696) (23,192)
Amounts reclassified from other accumulated comprehensive income 14 19 28 37
Net current-period other comprehensive income (loss) (2,415) (8,930) (668) (23,155)
Ending balance $ (44,688) $ (70,518) $ (44,688) $ (70,518)