Income Taxes - Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Reconciliation [Line Items]
Statutory tax expense (benefit)	$ 59,706	$ (41,932)	$ 38,813
Valuation allowance	9,458	43,884	1,609
Foreign tax rate differential	(14,853)	(12,432)	(14,332)
Foreign subsidiary earnings	14,621	59,460	10,648
Accrual adjustments	2,243	5,755	494
Non-deductible goodwill	0	5,189	0
FCPA provision, nondeductible portion	0	5,412	2,939
Other	(642)	3,035	3,478
Income tax expense	53,570us-gaap_IncomeTaxExpenseBenefit	56,715us-gaap_IncomeTaxExpenseBenefit	28,225us-gaap_IncomeTaxExpenseBenefit
Brazil
Income Tax Reconciliation [Line Items]
Brazil nontaxable incentive	(15,454)	(7,849)	(10,622)
Brazil tax goodwill amortization	$ (1,509)	$ (3,807)	$ (4,802)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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