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Leases - Schedule of Lease Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$ 4,755
Operating cash flows from finance leases		16
Financing cash flows from finance leases		1,063
Noncash activities from right-of-use assets obtained in exchange for lease obligations:
Operating leases		6,568
Finance leases		453
Noncash activities from adoption of ASC 842 as of January 1, 2019
Prepaid expenses and other current assets	$ (884)	(3,031)	$ (16,770)
Operating lease assets	54,069	55,408
Operating lease liabilities	64,506	$ 69,622
Accrued liabilities	$ (11,321)

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Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract]

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Amount of interest paid on finance lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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