Right-of-Use ("ROU") Assets and Lease Liabilities - Schedule of Operating and Finance Lease Maturity (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
2019 (excluding the six months ended June 30, 2019)	$ 15,542
2020	28,992
2021	26,518
2022	20,568
2023	14,705
2024 and thereafter	21,785
Total lease payments	128,110
Less amount representing interest	(14,798)
Total	113,312
Current portion of lease liabilities	25,730
Long-term portion of lease liabilities	87,582
Finance Leases
2019 (excluding the six months ended June 30, 2019)	1,554
2020	2,913
2021	2,450
2022	1,501
2023	982
2024 and thereafter	155
Total lease payments	9,555
Less amount representing interest	(833)
Total	8,722
Current portion of lease liabilities	2,677
Long-term portion of lease liabilities	6,045
Total
2019 (excluding the six months ended June 30, 2019)	17,096
2020	31,905
2021	28,968
2022	22,069
2023	15,687
2024 and thereafter	21,940
Total lease payments	137,665
Less amount representing interest	(15,631)
Total	122,034
Current portion of lease liabilities	28,407
Long-term portion of lease liabilities	$ 93,627