Restructuring Charges - Roll-Forward of Accrued Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2015			$ 0
Restructuring charges	$ 1,642	$ 0	1,642	$ 0
Payments			(54)
Other			(185)
Accrued at June 30, 2015	1,403		1,403
Severance expenses
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2015			0
Restructuring charges			73
Payments			(54)
Other			0
Accrued at June 30, 2015	19		19
Write-downs and retirements of fixed assets
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2015			0
Restructuring charges			607
Payments			0
Other			(185)
Accrued at June 30, 2015	422		422
Lease cancellations
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2015			0
Restructuring charges			962
Payments			0
Other			0
Accrued at June 30, 2015	$ 962		$ 962