Leases - Schedule of Balances and Classification of Operating Lease Right-of-Use Assets and Operating Lease Liabilities within Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets:
Operating lease right-of-use assets	$ 193,419	$ 178,304	$ 0
Total Assets	193,419
Liabilities:
Current operating lease liabilities	41,828
Non-current operating lease liabilities	177,097	$ 161,464	$ 0
Total Liabilities	$ 218,925