Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Contingency
PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained			50.00%
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 9,200,000		$ 9,200,000		$ 10,100,000
Unrecognized Tax Benefits, Period Increase (Decrease)	(700,000)	(700,000)	(1,300,000)	(1,500,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6,700,000		6,700,000		7,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(300,000)	(400,000)	(700,000)	(1,300,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	(200,000)		(200,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	(1,200,000)		(1,200,000)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period			15,723,000
Additions based on tax positions related to current year			388,000
Additions for tax positions of prior years			367,000
Reductions for tax positions of prior years			(51,000)
Reductions due to lapse of applicable statute of limitations			(1,984,000)
Settlements			0
Balance end of period	14,443,000		14,443,000
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 200,000		$ 200,000		$ 400,000