Leases - Condensed Consolidated balance sheet information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Balance sheet information related to leases
Operating lease right-of-use assets	$ 110,559	$ 102,226
Operating lease right-of-use assets (Classification)	us-gaap:OperatingLeaseRightOfUseAsset
Finance lease right-of-use assets	$ 1,488
Finance lease right-of-use assets (Classification)	us-gaap:OtherAssetsNoncurrent
Total lease assets	$ 112,047
Operating	$ 34,342	31,479
Operating (Classification)	us-gaap:OperatingLeaseLiabilityCurrent
Finance	$ 370
Finance (Classification)	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Operating	$ 88,418	$ 82,510
Operating (Classification)	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance	$ 1,135
Finance (Classification)	us-gaap:LongTermDebtAndCapitalLeaseObligations
Total lease liabilities	$ 124,265