Leases - Supplemental Financial Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	$ 5,462
Operating leases	6,126
Operating lease assets	69,042	$ 0
Accrued expenses	15,174
Other liabilities	54,404	$ 0
Total operating lease liabilities	$ 69,578
Weighted-average remaining lease term (in years)	5 years 9 months 11 days
Weighted-average discount rate	6.31%
Held-for-sale
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 2,100
Accrued expenses	900
Other liabilities	$ 1,200