Leases - Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee Disclosure [Abstract]
Cash paid for operating leases included in operating activities	$ 39,239
Cash paid for finance leases included in operating activities	596
Cash paid for finance leases included in financing activities	4,544
Operating lease right-of-use assets obtained in exchange for lease obligations	54,053
Operating lease right-of-use assets and liabilities relieved in conjunction with divestiture of Xpress Internacional	$ 2,018