Property and Equipment, Net - Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation
Total depreciation expense	$ 94,331	$ 94,056	$ 86,810
Cost of sales
Depreciation
Total depreciation expense	84,449	85,357	78,975
Selling, general and administrative
Depreciation
Total depreciation expense	$ 9,882	$ 8,699	$ 7,835