Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Foreign tax credits		$ 11,836
Alternative minimum tax credits		7,604
Tax benefits related to share-based compensation	$ 3,291	4,469
2009Through 2013 IRS Audit [Member]
Income Tax Contingency [Line Items]
IRS audit period	5 years
IRS net refund	$ 44,241	$ 34,234	$ 34,234
Minimum Amount of Net Refund that needs to be Reviewed And Approved	5,000
Interest on net refund	$ 3,396