Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Income Tax Contingency [Line Items]
Understatement in deferred tax asset account	$ 17,520
Additional income tax benefit resulting from correction, amount	17,520
Accrued and recognized tax expense (benefit)	(2,154)	957
Foreign tax credits	90,941		74,255
Alternative minimum tax credits	64,088		93,336
Tax benefits related to share-based compensation	2		2,839
Deferred tax assets, valuation allowance, Total			0
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 benefit	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