Valuation and Qualifying Accounts Valuation and Qualifying Accounts (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]
Other Adjustments	$ 308	$ 1,740
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of Period	161,026	138,910	124,244
Other Adjustments	(5,058)	4,117	1,811
Additions Charged to Cost and Expense	100,651	17,999	12,855
Balance at End of Period Noncurrent	$ 256,619	$ 161,026	$ 138,910