Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1,200	$ (900)	$ (400)
Deferred Tax Assets, Gross, Noncurrent	(12,187)	0
Deferred tax assets:
Deferred compensation	38,602	46,973
Deferred income	9,830	18,787
Accrued expenses	24,663	12,624
Other	60,885	55,547
Gross deferred tax assets	133,980	133,931
Valuation allowance	4,200	0
Total deferred tax assets	129,780	133,931
Deferred tax liabilities:
Property and equipment	86,237	126,079
Unremitted foreign earnings	257,414	296,018
Basis difference in equity investments	10,055	7,678
Other	0	0
Deferred Tax Liabilities, Gross	353,706	429,775
Deferred Tax Assets (Liabilities), Net [Abstract]
Deferred tax liabilities	236,113	353,181
Deferred income taxes	0	(57,337)
Deferred Tax Assets, Gross, Noncurrent	(12,187)	0
Total deferred tax liabilities	$ 223,926	$ 295,844