Derivatives - Narrative (Details) € in Thousands, ₩ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, SEK in Thousands, MXN in Thousands, HKD in Thousands, DKK in Thousands, CAD in Thousands, BRL in Thousands, AUD in Thousands		12 Months Ended
	Dec. 19, 2012 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 AUD	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 DKK	Dec. 31, 2017 MXN	Dec. 31, 2017 CHF (SFr)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 CAD	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 SGD	Dec. 31, 2017 SEK	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 HKD	Dec. 31, 2017 BRL	Dec. 31, 2016 USD ($)	Aug. 05, 2016 USD ($)
Derivative [Line Items]
Deferred taxes used to offset fair value of interest rate swap		$ (2,200,000)															$ (1,900,000)
Maturity of derivative contract (up to)		2 years
Revenue and cost of sales
Derivative [Line Items]
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross		$ 44,000
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax		33,000
Interest expense
Derivative [Line Items]
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross		1,100,000
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax		840,000
Interest rate swap
Derivative [Line Items]
Notional amount of derivative	$ 150,000,000																	$ 42,500,000
Fixed rate	0.9825%																	1.12%
Quarterly reduction of notional amount	50.00%
Deferred taxes used to offset fair value of interest rate swap		$ (1,500,000)
Interest rate swap | Maximum
Derivative [Line Items]
Notional amount of derivative																		$ 175,000,000
Foreign currency forward contracts | Designated as hedging instrument
Derivative [Line Items]
Average number of contracts entered into per month		100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Foreign currency forward contracts | Not designated as hedging instrument
Derivative [Line Items]
Notional amount of derivative			AUD 5,600	¥ 22,990	DKK 1,881	MXN 17,540	SFr 242	₩ 1,800,000	£ 1,868	CAD 2,076	¥ 178,500	SGD 5,023	SEK 4,775	€ 23,333	HKD 11,000	BRL 8,500
Average number of contracts entered into per month		20	20	20	20	20	20	20	20	20	20	20	20	20	20	20