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Debt - 5% Convertible Senior Note Due 2021 (Details)			1 Months Ended	12 Months Ended
	Jun. 27, 2016 USD ($) shares	Jun. 21, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) day	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 15, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings				$ 616,706,000	$ 354,682,000	$ 208,158,000
Principal amount of long-term debt				415,000,000	400,420,000
Unamortized discount (premium) and debt issuance costs				$ 30,188,000	30,024,000
5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate			5.00%	5.00%
Tranche B Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt				$ 0	$ 60,361,000
Convertible Debt | 5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Aggregate principal amount			$ 115,000,000
Additional principal amount			15,000,000
Proceeds from borrowings			$ 111,600,000
Debt instrument, interest rate				5.00%	0.50%
Conversion rate	55.5556
Number of equity instruments | shares	6,388,894
Conversion price | $ / shares		$ 18.00
Threshold percentage of stock price trigger	140.00%
Threshold trading days | day			20
Threshold consecutive trading days			30 days
Redemption price, percentage	100.00%
Long-term debt, fair value	$ 89,300,000
Carrying amount of equity component	22,200,000
If-converted value in excess of principal				$ 8,200,000
Principal amount of long-term debt				115,000,000	$ 115,000,000
Unamortized discount (premium) and debt issuance costs				19,500,000
Term Loan | Tranche B Term Loan
Debt Instrument [Line Items]
Repayments of debt		$ 5,000,000
Deferred finance costs, net							$ 2,500,000
Long-term Debt | Convertible Debt | 5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Deferred finance costs, net	$ 600,000
Reported Value Measurement | 5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, fair value				$ 95,486,000	$ 91,029,000

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Debt Instrument, Additional Principal Amount

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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