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Debt - Exchangeable Senior Notes (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Aug. 31, 2014 USD ($) $ / shares
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 1,300,000	$ 1,300,000
Convertible Debt | Exchangeable Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Debt instrument face amount			$ 250,000,000.0
Stated rate	2.625%		2.625%
Shares converted (in shares)	0.0516108
Conversion price (in USD per share) | $ / shares			$ 19.38
Interest expense debt	$ 2,400,000	2,400,000
Contractual interest rate	1,600,000	1,600,000
Accretion of debt discount	700,000	700,000
Amortization of deferred financing costs	$ 100,000	$ 100,000

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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

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