Finance Obligations - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Sale Leaseback Transaction [Line Items]
Total operating lease, liabilities	$ 113,938
Short term operating lease obligation	14,314	$ 10,609	$ 9,453	$ 8,959	$ 9,428	$ 8,666	$ 7,512	$ 7,042
Long term operating lease obligation	99,624	74,422	58,410	52,165	50,937	36,599	30,631	25,657
Total finance lease liabilities	5,396
Short term finance lease obligation	903	374	345	204	226	310	266	236
Long term finance lease obligation	4,493	$ 2,384	$ 2,465	$ 1,953	2,011	$ 2,068	$ 2,123	$ 2,142
Sale Leaseback Agreements
Sale Leaseback Transaction [Line Items]
Total operating lease, liabilities	157,700				112,400
Short term operating lease obligation	24,700				16,800
Long term operating lease obligation	132,900				95,600
Total finance lease liabilities	23,852				31,700
Short term finance lease obligation	8,000				7,900
Long term finance lease obligation	$ 15,900				$ 23,800