Other Current Assets - Schedule of Other Current Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) parcelofland	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) parcelofland	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 20,734		$ 20,734		$ 18,412
Other current assets	2,583		2,583		6,831
Land held for sale	0		0		7,000
Total	$ 23,317		$ 23,317		32,243
Parcels of land, sold | parcelofland	1,000,000		1,000,000
Property, plant and equipment, book value	$ 149,084		$ 149,084		$ 127,535
Gain on sale of assets, net	0	$ 82	100	$ 82
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, book value	$ 7,000		7,000
Gain on sale of assets, net			$ 100