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Income Taxes (Effective Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Federal income tax rate   $ (2,524) $ (26,160) $ (2,992)
State income tax rate, net of federal benefit   (202) (543) 2,598
Effect of rate differences   (12,624) (3,678) (3,362)
Non-deductible / Non-taxable items   2,694 (2,181) (9,904)
Change in valuation allowance $ 4,700 16,041 10,892 5,370
U.S. tax on foreign earnings   23,130 82,311 17,196
Foreign tax credits   (18,581) (49,432) (11,026)
Uncertain tax positions   19 (3,952) (25,172)
Audit settlements   253 1,167 13,448
Stock Compensation Windfall / Shortfall   2,120 0 0
Deferred income tax account adjustments   (842) 0 8,679
Write-off of income tax receivable   0 0 1,577
Other   (203) 28 (35)
Total income tax expense (benefit)   $ 9,281 $ 8,452 $ (3,623)
Federal income tax rate (percent)   35.00% 35.00% 35.00%
State income tax rate, net of federal benefit (percent)   2.80% 0.70% (30.40%)
Effects of rates differences (percent)   175.00% 4.90% 39.30%
Non-deductible/Non-taxable items (percent)   (37.40%) 2.90% 115.80%
Change in valuation allowance (percent)   (222.40%) (14.50%) (62.80%)
U.S. tax on foreign earnings (percent)   (320.60%) (110.00%) (201.20%)
Non-U.S. foreign tax credits (percent)   257.60% 66.10% 129.00%
Uncertain tax positions (percent)   (0.30%) 5.30% 294.40%
Audit settlements (percent)   (3.50%) (1.60%) (157.30%)
Stock Compensation Windfall / Shortfall (percent)   (29.40%) (0.00%) (0.00%)
Deferred income tax account adjustments (percent)   11.70% 0.00% (101.50%)
Write-off of income tax receivable (percent)   0.00% 0.00% (18.40%)
Other (percent)   2.80% (0.10%) 0.50%
Effective income tax rate (percent)   (128.70%) (11.30%) 42.40%