Debt Senior Notes (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ (7,677,000)	$ 0
8.25% Interest Rate [Member]
Debt Instrument [Line Items]
Senior Notes Aggregate Redemption Amount	156,200,000
Loss on early extinguishment of debt	7,700,000
Redemption Premium	6,200,000
Debt Instrument, Unamortized Discount	1,500,000
Senior Notes [Member] | 8.25% Interest Rate [Member]
Debt Instrument [Line Items]
Principal	150,000,000
Stated interest rate, senior notes	8.25%
Senior Notes [Member] | 6.5% Interest Rate [Member]
Debt Instrument [Line Items]
Principal	$ 300,000,000
Stated interest rate, senior notes	6.50%	6.50%