Quarterly report pursuant to Section 13 or 15(d)

Convertible Debt (Details)

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Convertible Debt (Details) - Jun. 29, 2015 - Convertible Debt [Member] - Convertible Senior Notes Due 2020 [Member] - USD ($)
Total
Debt Instrument [Line Items]  
Aggregate principal amount $ 115,000,000
Coupon rate 7.00%
Conversion rate, principal amount of convertible note $ 1,000
Percentage of principal amount redeemed 100.00%
Common Stock [Member]  
Debt Instrument [Line Items]  
Conversion rate, number of common stock (in shares) 151.5152
Conversion price per share of common stock $ 6.60