Debt and Credit Facility, Narrative (Details)		12 Months Ended
		Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2015 USD ($)	May. 23, 2012 USD ($)	Mar. 31, 2010 USD ($)
Debt Instrument [Line Items]
Loss on Repurchase of Debt Instrument	[1]	$ (2,500,000)	$ 0	$ 0
Long-term debt		197,800,000	225,000,000
Repayments of Unsecured Debt	[1]	30,000,000	0	0
Derivative Asset		$ 1,600,000	85,700,000
Line of Credit
Debt Instrument [Line Items]
Percentage of net orderly liquidation value of eligible inventory		85.00%
Line of Credit | Borrowing Availability Under $45.0 Million
Debt Instrument [Line Items]
Line of Credit, Ability to Make Restricted Actions, Available Borrowing Necessary After Action with Fixed Charge Coverage Ratio		$ 45,000,000
Senior Notes Due 2020 | Senior Notes
Debt Instrument [Line Items]
Principal amount of notes						$ 225,000,000
Interest rate						8.25%
Percentage of principal amount issued						100.00%
Interest Expense including amortization of deferred financing cost		$ 18,800,000	19,400,000	$ 19,400,000
Effective interest rate		8.60%
Consolidated Total Indebtedness to EBITDA Ratio		2.00
Debt Instrument, Periodic Payment, Principal		$ 27,200,000
Percentage of principal amount repurchased		107.50%
Debt Instrument, Periodic Payment, Interest		$ 800,000
Loss on Repurchase of Debt Instrument		2,500,000
Long-term debt		197,800,000	225,000,000
Debt Instrument, Fair Value Disclosure		207,300,000	244,500,000
Repayments of Unsecured Debt		$ 30,000,000
Senior Notes Due 2020 | Senior Notes | Change in control
Debt Instrument [Line Items]
Redemption price percentage of principal amount		101.00%
Senior Notes Due 2020 | Senior Notes | On or after June 1, 2016
Debt Instrument [Line Items]
Redemption price percentage of principal amount		104.125%
Senior Notes Due 2020 | Senior Notes | On or after June 1, 2017
Debt Instrument [Line Items]
Redemption price percentage of principal amount		102.0625%
Senior Notes Due 2020 | Senior Notes | On or after June 1, 2018
Debt Instrument [Line Items]
Redemption price percentage of principal amount		100.00%
Senior Notes Due 2020 | Senior Notes | On or after June 1, 2015 but prior to June 1, 2016
Debt Instrument [Line Items]
Redemption price percentage of principal amount		100.00%
Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Principal amount of notes							$ 175,000,000
Interest rate							4.50%
Effective interest rate		11.00%
Redemption price percentage of principal amount		154.261%
Debt Instrument, Periodic Payment		$ 3,900,000
Long-term debt			172,500,000
Debt Instrument, Unamortized Discount			$ (2,500,000)
Debt Instrument, Convertible, Threshold Consecutive Trading Days		50 days
Repayments of Unsecured Debt		$ 273,800,000
Debt Instrument, Convertible, If-converted Value in Excess of Principal		94,900,000
Derivative Asset					$ 94,900,000
Net cash outflow in convertible debt settlement		$ 178,900,000
Stock Issued During Period, Shares, Other | shares		1,015,185
Convertible Notes | Convertible Notes Payable | Warrant Transactions
Debt Instrument [Line Items]
Common stock sold related to option counterparties net share-settled warrants | shares		3,700,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300,000,000
Percentage of eligible accounts receivable for borrowing base		85.00%
Percentage of eligible inventory for borrowing base		75.00%
Maximum amount of eligible machinery and equipment for borrowing base		$ 60,000,000.00
Line of Credit Facility, Possible Future Maximum Borrowing Capacity		400,000,000
Available borrowing capacity		288,100,000
Outstanding line of credit		0
Remaining available borrowing capacity		$ 280,800,000
Interest on Revolving Credit Facility		3.75%
Minimum Amount of Available Borrowing to Maintain		$ 52,500,000
Revolving Credit Facility | Line of Credit | Borrowing Availability Under $45.0 Million
Debt Instrument [Line Items]
Fixed Charge Coverage Ratio		1.15
Revolving Credit Facility | Line of Credit | Borrowing Availability Under $30.0 Million
Debt Instrument [Line Items]
Fixed Charge Coverage Ratio		1.0
Line of Credit, Minimum Borrowing Availability Threshold to Maintain Fixed Charge Coverage Ratio		$ 30,000,000
Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		20,000,000
Outstanding line of credit		$ (7,300,000)

[1] See Note 3 for more information relating to the Senior Notes (defined in Note 3) and the Convertible Notes.