Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Tax benefits from IRS tax settlements and resolution of U.S. tax examinations	$ 15,000	$ 20,000	$ 22,000
Tax benefits from the retroactive effect U.S. tax legislation	58,000	$ 3,000	$ 5,000
Valuation allowance on tax attribute carryovers	$ 6,000
U.S. statutory rate	35.00%	35.00%	35.00%
Net operating loss carryforwards	$ 279,000
Indefinite lived net operating loss carryforwards	$ 225,000
Operating loss carryforwards, expiration period	15 years
Tax credit carry forwards	$ 53,181	$ 54,183
Tax credit carry forward without expiration	39,000
Income taxes on cumulative undistributed earnings of foreign subsidiaries	850,000
Withholding taxes on undistributed earnings of foreign subsidiaries	12,000
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 104,000	117,000	$ 109,000
Possible change to unrecognized tax benefits	25.00%
Recorded income tax interest and penalties, less than	$ 1,000	(4,000)	$ 2,000
Income tax interest and penalties accrued	$ 9,000	$ 10,000
Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration period	10 years
Maximum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration period	15 years