Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Income Tax Contingency [Line Items]
Accrual withholding taxes percent	5.00%
Accrual Withholding Taxes	$ 0
Understatement in deferred tax asset account		17,520
Additional income tax benefit resulting from correction, amount		17,520
Income Tax Examination, Penalties and Interest Expense		(2,154)
Tax benefits related to share-based compensation	6,603		4,562
Foreign tax credits	64,902		74,255
Alternative minimum tax credits	44,954		93,336
Net operating loss carryforward	3,296		3,805
2007 And 2008 IRS Audit [Member]
Income Tax Contingency [Line Items]
Additional income tax benefit resulting from correction, amount		12,747
IRS audit, interest paid		1,702
IRS audit, additional income tax expense		354
IRS audit, decrease in reserve for uncertain tax positions		(31,912)
IRS audit, decrease in reserve for uncertain tax positions, interest related		2,154
IRS audit, income tax benefit		$ (34,067)