Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Assets:
Total assets	$ 752,047	$ 723,163
Liabilities:
Total liabilities	67,546	72,125
Interest rate swaps
Liabilities:
Foreign exchange contracts	27,569
Foreign exchange contracts
Assets:
Foreign exchange contracts	40,074	68,814
Cash collateral for foreign exchange contracts	8,111	9,644
Liabilities:
Foreign exchange contracts	39,977	72,125
Cash collateral obligation for foreign exchange contracts	40,832	73,140
Repurchase agreements
Assets:
Total assets	625,926	581,293
Money market
Assets:
Total assets	50,891	50,644
Certificates of deposit
Assets:
Total assets	35,156	22,412
Level 1
Assets:
Total assets	0	21
Liabilities:
Total liabilities	0	0
Level 1 | Foreign exchange contracts
Assets:
Foreign exchange contracts	0	21
Liabilities:
Foreign exchange contracts	0	0
Level 2
Assets:
Total assets	752,047	723,141
Liabilities:
Total liabilities	67,546	72,125
Level 2 | Foreign exchange contracts
Assets:
Foreign exchange contracts	40,074	68,793
Liabilities:
Foreign exchange contracts	39,977	72,125
Level 2 | Repurchase agreements
Assets:
Total assets	625,926	581,293
Level 2 | Money market
Assets:
Total assets	50,891	50,644
Level 2 | Certificates of deposit
Assets:
Total assets	35,156	$ 22,412
Telematics
Liabilities:
Impairment of investment	15,700
Accumulated impairment on investment	$ 136,300