Long-Term Debt and Capital Lease Obligations - Convertible Notes (Details Textual) $ / shares in Units, shares in Millions		3 Months Ended	6 Months Ended
	Mar. 30, 2015 USD ($)	Mar. 31, 2015 Days	Jun. 30, 2015 USD ($) Days $ / shares shares
Debt Instrument [Line Items]
Carrying amount of equity component			$ 32,284,000
2.50% Convertible Notes
Debt Instrument [Line Items]
Long-term portion of Convertible Notes	$ 115,000,000		$ 115,000,000
Interest rate on convertible senior notes	2.50%		2.50%
Maturity date of convertible senior notes			Apr. 01, 2022
Net proceeds from the convertible notes	$ 111,200,000
Proportion of principal amount of notes			$ 1,000
Proportion of shares of common stock			70.2790
Effective conversion price of common stock, per share | $ / shares			$ 14.23
Number of shares issued upon conversion | shares			8.1
Carrying amount of debt component of convertible notes			$ 81,600,000
Carrying amount of equity component			33,400,000
Transaction costs on debt related to issuance of convertible notes			2,700,000
Transaction costs on equity related to issuance of convertible notes			1,100,000
Carrying amount of equity component, net of issuance costs			$ 32,300,000
Debt instrument, effective interest rate			8.29%
2.50% Convertible Notes | Condition One
Debt Instrument [Line Items]
Number of trading days | Days		20
Number of consecutive trading days		30 days
Percentage of conversion price of convertible notes on applicable trading day		130.00%
2.50% Convertible Notes | Condition Two
Debt Instrument [Line Items]
Number of trading days | Days			10
Number of consecutive trading days			5 days
2.50% Convertible Notes | Condition Two | Maximum
Debt Instrument [Line Items]
Percentage of closing sale price of common stock			98.00%