Long-Term Debt and Capital Lease Obligations - Convertible Notes (Details Textual) - 2.50% Convertible Notes $ / shares in Units, shares in Millions		9 Months Ended
	Mar. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) d $ / shares shares	Sep. 30, 2015
Debt Instrument [Line Items]
Aggregate principal amount of convertible notes	$ 115,000,000	$ 115,000,000
Convertible notes stated interest percentage	2.50%	2.50%	2.50%
Maturity date of convertible senior notes		Apr. 01, 2022
Net proceeds from the convertible notes net of transaction fees	$ 111,200,000
Convertible notes interest payable term		Semiannually
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%
During Twenty Trading Days in Period of Thirty Consecutive Trading Days
Debt Instrument [Line Items]
Number of trading days | d		20
Number of consecutive trading days		30 days
Percentage of conversion price of convertible notes on applicable trading day		130.00%
During Ten Consecutive Business Day Immediately After Any Five Consecutive Trading Day
Debt Instrument [Line Items]
Number of trading days | d		10
Number of consecutive trading days		5 days
During Ten Consecutive Business Day Immediately After Any Five Consecutive Trading Day | Maximum
Debt Instrument [Line Items]
Percentage of closing sale price of common stock		98.00%