Debt (Details) - USD ($)	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	May 02, 2016
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total debt	$ 385,968,000	$ 387,833,000
Line of Credit Facility, Fair Value of Amount Outstanding	33,881,000	33,881,000
Current portion of long-term debt	0	(2,000,000)
Total long-term debt	385,968,000	385,833,000
Amortization of Financing and Debt Discount	(900,000)	(1,000,000)
Interest expense
Contractual interest expense	9,710,000		$ 9,746,000
Interest Costs Capitalized Adjustment	(52,000)		0
Amortization of debt issuance costs	348,000		348,000
Amortization of debt (premium) discount	(199,000)		(181,000)
Amortization of Acquisition Costs	41,000		53,000
Interest expense on capital lease	75,000		47,000
Total interest expense	9,923,000		10,013,000
Line of Credit Facility [Abstract]
Proceeds from Lines of Credit	0
Repayments of lines of credit	0		$ 2,500,000
10.5% Senior Notes, net (1)
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total debt	352,087,000	353,952,000
Amortization of Financing and Debt Discount	$ (913,000)			$ (1,047,000)
Line of Credit Facility [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	10.50%
Long-term Debt, Unclassified [Abstract]
Repayments of Debt	$ 2,000,000
Long-term debt outstanding	353,000,000	354,999,000
Interest payable	6,200,000	15,500,000
Revolving Line of Credit
Line of Credit Facility [Abstract]
Line of Credit Facility, Current Borrowing Capacity					$ 65,000,000
Remaining borrowing capacity	31,100,000
Domestic Line of Credit [Member]
Debt, Long-term and Short-term, Combined Amount [Abstract]
Line of Credit Facility, Fair Value of Amount Outstanding	19,881,000	19,881,000
Line of Credit Facility [Abstract]
Proceeds from Lines of Credit	0
Repayments of lines of credit	$ 0
Domestic Line of Credit [Member] | Base Rate [Member]
Line of Credit Facility [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Foreign Line of Credit [Member]
Line of Credit Facility [Abstract]
Proceeds from Lines of Credit	$ 0
Foreign Line of Credit [Member] | LIBOR
Line of Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate	2.50%
US Facility [Member] | Base Rate [Member]
Line of Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Letter of Credit One [Member] | Foreign Line of Credit [Member]
Debt, Long-term and Short-term, Combined Amount [Abstract]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 12,000,000	$ 12,000,000
Letter of Credit One [Member] | Foreign Line of Credit [Member] | LIBOR
Line of Credit Facility [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Letter of Credit Two [Member] | Foreign Line of Credit [Member]
Debt, Long-term and Short-term, Combined Amount [Abstract]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 2,000,000
Letter of Credit Two [Member] | Foreign Line of Credit [Member] | LIBOR
Line of Credit Facility [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%