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Derivative Contracts - Fair Value and Presentation in Consolidated Balance Sheets for Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Derivative equity	$ 515	$ 0	$ 193	$ 0
Foreign exchange contract
Derivative [Line Items]
Derivative equity			303		$ 496
Foreign exchange contract \| Other current assets \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	303		303		496
Interest swap contract \| Accrued liabilities
Derivative [Line Items]
Derivative liabilities	1,318		1,318		0
Interest swap contract \| Other assets, net \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	353		353		1,131
Fair Value, Recurring \| Foreign exchange contract
Derivative [Line Items]
Derivative assets	303		303		496
Derivative equity			303		496
Fair Value, Recurring \| Interest swap contract
Derivative [Line Items]
Derivative assets	353		353		1,131
Derivative liabilities	1,318		1,318		0
Level 2 \| Fair Value, Recurring \| Foreign exchange contract
Derivative [Line Items]
Derivative assets	303		303		496
Derivative equity			303		496
Level 2 \| Fair Value, Recurring \| Interest swap contract
Derivative [Line Items]
Derivative assets	353		353		1,131
Derivative liabilities	$ 1,318		$ 1,318		$ 0