Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Rent expense	$ 10,700	$ 8,100	$ 5,500
Proceeds from sale-leaseback transactions	2,017	$ 5,521	$ 24,000
Term of lease		7 years	19 years 10 months
Training and hiring grants from Ireland	0	$ 0	$ 1,200
Deferred credits	2,700	2,900
Property, plant, and equipment grants from Ireland	171	$ 175	$ 139
Irish grants refundable if operations discontinued	$ 3,900
Remaining grant liability period	3 years
Minimum
Other Commitments [Line Items]
Grant period	5 years
Maximum
Other Commitments [Line Items]
Grant period	8 years