Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Valuation allowance		$ (14,156)	$ (16,673)
Decrease in unrecognized tax benefits for closed tax years	$ 20,300
Income tax expense (benefit)		80,652	(7,484)	$ 23,983
Unrecognized tax benefits		69,801	$ 54,621	$ 66,918
Accrued interest and penalties		2,800
Research
Operating Loss Carryforwards [Line Items]
Undistributed earnings from foreign subsidiaries		2,750,000
Tax credit carryforward		6,100
United States
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards		92,100
Foreign jurisdictions
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards		58,900
Long-term Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits		$ 25,100