Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Deferred tax assets	$ 26,594,000	$ 43,305,000
Potential affect of unrecognized tax benefits on effective tax rate	8,000,000
Interest accrued on unrecognized tax benefits	2,400,000	2,500,000
Income Tax Benefit, Recognition of Previously Unrecognized Tax Benefits	3,100,000	5,500,000
Current period tax benefit due to realization of previously unrecognized tax benefits			(1,600,000)
Potential change in unrecognized tax benefits	7,000,000
Unrecognized tax deductions, share-based compensation	23,000,000
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	57,000,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 266,000,000