Other Current Assets - Schedule of Other Current Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) parcelofland	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 22,259		$ 18,412
Other current assets	5,676		6,831
Land held for sale	0		7,000
Total	$ 27,935		32,243
Parcels of land, sold | parcelofland	1
Property, plant and equipment, book value	$ 134,861		$ 127,535
Gain on sale of assets, net	100	$ 0
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, book value	7,000
Gain on sale of assets, net	$ 100