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INCOME TAXES - Unrecognized Tax Benefit Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Balance at the beginning of the period     $ 7,138 $ 16,883 $ 25,965
Reductions related to prior year tax positions $ 6,100   1,458 0 (8,928)
Increases related to current year tax positions     472 1,450 693
Reductions related to settlements with taxing authorities     (1,517) (2,910) (847)
Reductions related to expiration of the applicable statute of limitations     (4,294) (8,285) 0
Balance at the end of the period     3,257 7,138 16,883
Accrued interest and penalties related to unrecognized tax benefits     200 $ 700 1,200
Reduction in liability for unrecognized tax benefits related to continuing operations   $ 5,100     $ 11,200
Maximum expected reduction in liability over next twelve months for unrecognized tax benefits related to continuing operations due to statue of limitations     $ 1,000