Long-Term Debt and Other Financing Arrangements - Summary of Debt Conversion (Details) - USD ($) shares in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2013	May. 20, 2013
Debt Conversion [Line Items]
Principal Amount Converted							$ 6,491,000	$ 76,040,000
Loss on extinguishment of debt	$ 0			$ (12,936,000)			(2,254,000)	$ (39,615,000)
8.00% Convertible Senior Notes Issued in 2013
Debt Conversion [Line Items]
Debt conversion, converted instrument, amount							$ 39,400,000
Loan interest rate									8.00%	8.00%
Principal Amount Converted	$ 0	$ 6,254,000	$ 237,000	$ 6,807,000	$ 10,535,000	$ 7,046,000			$ 1,000
Shares of Voting Common Stock Issued	0	10,379	418	11,411	18,611	14,624	71,100
Loss on extinguishment of debt	$ 0	$ 2,189,000	$ 65,000	$ 12,936,000	$ 20,387,000	$ 10,497,000