Income Taxes (Changes in Valuation Allowance) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 46,048	$ 77,629	$ 76,452
Charge (benefit) to provision for income taxes	3,507	(9,302)	(1,805)
Charge (benefit) to other comprehensive income	16,931	(22,279)	2,982
Ending balance	$ 66,486	$ 46,048	$ 77,629