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Accumulated Other Comprehensive Income (Loss) - Reconciliation of Accumulated Other Comprehensive Loss (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     $ 1,095,681,000 $ 1,077,721,000
Purchase of redeemable non-controlling interest   $ 46,018,000   46,018,000
Ending balance $ 1,518,205,000 1,066,921,000 1,518,205,000 1,066,921,000
Unrealized Gains and Losses on Available- for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 59,000 (178,000) (212,000) (129,000)
Other comprehensive income (loss) (62,000) 99,000 209,000 50,000
Purchase of redeemable non-controlling interest 0 0 0 0
Ending balance (3,000) (79,000) (3,000) (79,000)
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Tax effect on accumulated unrealized losses 5,025,000 1,414,000 5,025,000 1,414,000
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (104,079,000) (67,344,000) (103,239,000) (50,452,000)
Other comprehensive income (loss) 1,549,000 (32,490,000) 709,000 (49,382,000)
Purchase of redeemable non-controlling interest 0 (9,108,000) 0 (9,108,000)
Ending balance (102,530,000) (108,942,000) (102,530,000) (108,942,000)
Amounts reclassified from accumulated other comprehensive income $ 0 $ 0 $ 0 $ 0