Income Taxes Income Tax Contingency (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ (1,100,000)	$ 900,000	$ (100,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,500,000	3,600,000	2,700,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	1,441,000	1,747,000	1,848,000
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	56,000	(501,000)	(425,000)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	(947,000)	0	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(1,188,000)	(2,117,000)	(5,627,000)
Unrecognized Tax Benefits	$ 11,747,000	$ 12,385,000	$ 13,256,000	$ 17,460,000