Derivative Instruments, Hedging Activities and Fair Value - Fair Value of Outstanding Derivative Contracts (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative contracts
Asset derivatives	$ 8,531	$ 5,018
Liability derivatives	6,282	4,783
Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	7,795	3,559
Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	1,547	2,934
Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives	736	1,331
Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		128
Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	96
Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	4,639	1,849
Fair Value of Derivatives Designated as Hedging Instruments
Derivative contracts
Asset derivatives	3,011	4,429
Liability derivatives	4,856	1,873
Fair Value of Derivatives Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	2,275	2,970
Fair Value of Derivatives Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	121	24
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives	736	1,331
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		128
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	96
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	4,639	1,849
Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative contracts
Asset derivatives	5,520	589
Liability derivatives	1,426	2,910
Fair Value of Derivatives Not Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	5,520	589
Fair Value of Derivatives Not Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	1,426	2,910
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives	0	0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	$ 0	$ 0