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Income Taxes - Unrecognized Tax Benefits Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Unrecognized Tax Benefits Reconciliation      
Balance at beginning of year $ 36,935 $ 44,701 $ 45,987
Additions based on tax positions taken during a prior period 2,356 2,568 3,792
Reductions based on tax positions taken during a prior period (6,305) (9,482) (7,737)
Additions based on tax positions taken during the current period 3,935 8,440 5,518
Reductions related to settlement of tax matters (2,795) (4,143) (317)
Reductions related to a lapse of applicable statute of limitations (2,592) (5,149) (2,542)
Balance at end of year 31,534 36,935 $ 44,701
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 6,881 $ 8,878