Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Assets:
Total assets		$ 840,274	$ 723,163
Liabilities:
Total liabilities		105,208	72,125
Interest rate swaps
Liabilities:
Foreign exchange derivative contracts		61,632
Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts		44,513	68,814
Cash collateral for foreign exchange derivative contracts		6,123	9,644
Liabilities:
Foreign exchange derivative contracts		43,576	72,125
Cash collateral obligation for foreign exchange derivative contracts		7,123	73,140
Repurchase agreements
Assets:
Total assets		716,155	581,293
Money market
Assets:
Total assets		51,151	50,644
Certificates of deposit
Assets:
Total assets		28,455	22,412
Level 1
Assets:
Total assets		0	21
Liabilities:
Total liabilities		0	0
Level 1 | Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts		0	21
Liabilities:
Foreign exchange derivative contracts		0	0
Level 2
Assets:
Total assets		840,274	723,142
Liabilities:
Total liabilities		105,208	72,125
Level 2 | Interest rate swaps
Liabilities:
Foreign exchange derivative contracts		61,632
Level 2 | Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts		44,513	68,793
Liabilities:
Foreign exchange derivative contracts		43,576	72,125
Level 2 | Repurchase agreements
Assets:
Total assets		716,155	581,293
Level 2 | Money market
Assets:
Total assets		51,151	50,644
Level 2 | Certificates of deposit
Assets:
Total assets		28,455	$ 22,412
Telematics
Liabilities:
Impairment of investment	$ 15,700
Accumulated impairment on investment		$ 136,300