Other Current Assets Schedule of Other Current Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) parcelofland	Dec. 31, 2017 USD ($)
Assets, Current [Abstract]
Prepaid expenses	$ 16,998	$ 14,205
Other current assets	7,096	4,762
Land held for sale	9,971	7,000
Total	$ 34,065	$ 25,967
Parcels of land reclassified to held for sale | parcelofland	1
Transfered to land held for sale	$ 3,000