Financing Arrangements - Schedule of Financing Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 179,499	$ 183,118
Unamortized discount and debt issuance costs	(17,752)	(22,643)
Long-term debt	161,747	160,475
Long-term debt, current maturities, gross	(2,522)	(1,518)
Unamortized discount and debt issuance costs, current	0	0
Long-term debt, current maturities	(2,522)	(1,518)
Long-term debt, excluding current maturities, gross	176,977	181,600
Unamortized discount and debt issuance costs, noncurrent	(17,752)	(22,643)
Long-term debt, excluding current maturities	159,225	158,957
Convertible Notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt			$ 83,300
Other debt [Member]
Debt Instrument [Line Items]
Long-term debt, gross	3,199	1,518
Long-term debt	3,199	1,518
Revolving credit facility [Member] | ABL Facility [Member]
Debt Instrument [Line Items]
Long-term debt, gross	76,300	81,600
Long-term debt	76,300	81,600
Senior notes [Member] | Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	100,000	100,000
Unamortized discount and debt issuance costs	(17,752)	(22,643)
Long-term debt	$ 82,248	$ 77,357