Debt Senior Notes (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended		24 Months Ended			3 Months Ended
	Sep. 30, 2014	Nov. 14, 2016	Nov. 14, 2015	Nov. 15, 2018	Dec. 31, 2013	Sep. 30, 2014 2018 Senior Notes [Member]	Sep. 30, 2014 2017 Convertible Senior Notes [Member]	Sep. 30, 2014 2018 Convertible Senior Notes [Member]	Sep. 30, 2014 Face Value [Member]	May 08, 2012 Face Value [Member]	Nov. 12, 2010 Face Value [Member]	Sep. 30, 2014 Base of restricted payments basket income calculation [Member]	Sep. 30, 2014 Percentage of our aggregate consolidated net income added to base amount of calculation [Member]	Sep. 30, 2014 Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member]	Sep. 30, 2014 Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member]
Debt Instrument [Line Items]
Senior notes	$ 228,369,000				$ 228,070,000				$ 230,000,000	$ 30,000,000	$ 200,000,000
Convertible senior subordinated notes due 2018	86,250,000				86,250,000
Convertible senior subordinated notes due 2017	57,500,000				57,500,000
Debt Instrument, Interest Rate, Stated Percentage						8.625%	3.25%	3.00%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		102.156%	104.313%	100.00%
Preferred Stock, Dividend Rate, Percentage	9.75%
Other Restrictions on Payment of Dividends												40,000,000
Percent restrictions on payment of dividends													50.00%	100.00%	100.00%
Restricted Payments Basket	145,700,000
Debt Instrument, Convertible, Conversion Ratio							42.0159	30.9478
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation							$ 1,000	$ 1,000
Debt Instrument, Convertible, Conversion Price							$ 23.80	$ 32.31
Stock Issued During Period, Shares, Other							2.4	2.7