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Income Taxes (Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-current deferred tax assets:    
Stock compensation expense $ 2,940 $ 4,597
Long-term accrued expenses 20,728 26,127
Net operating loss 42,956 36,424
Intangible assets 1,620 3,654
Future uncertain tax position offset 498 396
Unrealized loss on foreign currency 119 0
Foreign tax credit 67,655 69,586
Other 2,792 5,481
Valuation allowance (119,494) (90,900)
Total non-current deferred tax assets 19,814 55,365
Non-current deferred tax liabilities:    
Intangible assets 0 (41)
Unremitted earnings of foreign subsidiary 0 (32,427)
Property and equipment (9,640) (16,072)
Total non-current deferred tax liabilities $ 9,640 $ 48,540