Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Net of tax effect on unrealized loss on derivatives		$ 605	$ 901
Percentage of option to prepay in equity offerings		40.00%
Period of option to prepay using proceeds from equity offering		180 days
Percentage of principal amount outstanding		50.00%
Redemption price percentage		108.25%
Other Noncurrent Liabilities
Derivative [Line Items]
Fair value of embedded derivative liability	$ 0	$ 0		$ 13,200
Other Operating Income (Expense)
Derivative [Line Items]
Change in fair value in amount included as other income (expense)	0	13,200
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Notional foreign exchange contract outstanding	88,000	88,000		88,000
Loss recognized in other comprehensive income (loss)	900	1,400
Net of tax effect on unrealized loss on derivatives	600	900
Ineffective portion of loss	64	95
Designated as Hedging Instrument | Foreign Exchange Contract | Other Noncurrent Assets
Derivative [Line Items]
Fair value asset of derivative instrument	$ 100	$ 100		$ 2,400
Senior Secured Notes Due 2021
Derivative [Line Items]
Percentage of option to prepay principal amount (equal to)		100.00%
Senior Notes | Senior Secured Notes Due 2021
Derivative [Line Items]
Periodic payment		$ 575,000