Fair Value Measurement Fair Value Measurement - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revisions to estimates			$ 213	$ 2,969	$ 2,300
Restructuring and impairment (gains) charges, net			(6,003)	(2,643)	52,139
Asset Impairment Charges	$ 1,300			(1,300)
Non-cash impairment charges				(1,360)	3,164
Initial notional amount	100,000		100,000
Derivative Asset	600	$ 300	600	300
Derivative Liability		1,700		1,700
Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Gain (Loss) on Derivative, Net			(1,500)	(1,400)
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Gain (Loss) on Derivative, Net			400	2,000
Interest Rate Swap [Member] | Subsequent Event [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Initial notional amount						$ 98,800
Fixed rate on interest rate swap (plus applicable margin)						1.47%
Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)			$ (6,003)	(1,283)	48,975
Contract Termination [Member] | Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)	$ 1,000	$ (1,300)		$ (1,283)	$ 3,234
Notes Payable to Banks [Member] | Institutional Group Two [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.11%		6.11%
London Interbank Offered Rate (LIBOR) [Member] | Notes Payable to Banks [Member] | Institutional Group Two [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Variable Interest Rate	4.15%		4.15%