Leases - Condensed Consolidated balance sheet information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Balance sheet information related to leases
Operating lease right-of-use assets	$ 124,741	$ 110,559
Operating lease right-of-use assets (Classification)	us-gaap:OperatingLeaseRightOfUseAsset
Finance lease right-of-use assets	$ 3,016	1,488
Other assets	us-gaap:OtherAssetsNoncurrent
Total lease assets	$ 127,757	112,047
Operating	$ 35,002	34,342
Operating (Classification)	us-gaap:OperatingLeaseLiabilityCurrent
Finance	$ 707	370
Finance (Classification)	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Operating	$ 104,589	88,418
Operating (Classification)	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance	$ 2,472	1,135
Finance (Classification)	us-gaap:LongTermDebtAndCapitalLeaseObligations
Total lease liabilities	$ 142,770	$ 124,265