Finance Obligation - 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 finance lease liabilities	$ 5,396
Total operating lease, liabilities	113,938
Operating lease liabilities	14,314	$ 10,609	$ 9,453	$ 8,959	$ 9,428	$ 8,666	$ 7,512	$ 7,042
Operating lease liabilities	99,624	74,422	58,410	52,165	50,937	36,599	30,631	25,657
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 finance lease liabilities	23,852				31,700
Total operating lease, liabilities	157,700				112,400
Operating lease liabilities	24,700				16,800
Operating lease liabilities	132,900				95,600
Short term finance lease obligation	8,000				7,900
Long term finance lease obligation	$ 15,900				$ 23,800