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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due after one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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No definition available.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Summary of significant accounting policies Summary of significant accounting policies (Consolidated Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Balance Sheet
Deferred income taxes	$ 58,334	$ 74,299		$ 75,854
Accrued payroll and other liabilities - current	94,166	119,088		119,427
Accrued payroll and other liabilities - non-current	35,322	29,366		34,378
Retained earnings	413,074	401,134		397,338
Income Statement
Revenues	3,081,571	3,319,525	$ 2,928,630
Income tax expense	(48,136)	(53,314)	(59,641)
Franchise
Income Statement
Revenues	148,962	157,269	$ 125,296
Balances Without Adoption of ASC 606
Balance Sheet
Deferred income taxes	56,522
Accrued payroll and other liabilities - current	93,770
Accrued payroll and other liabilities - non-current	29,495
Retained earnings	417,485
Income Statement
Income tax expense	(48,393)
Balances Without Adoption of ASC 606 \| Franchise
Income Statement
Revenues	149,834
Previously Reported
Balance Sheet
Deferred income taxes		74,299
Accrued payroll and other liabilities - current		119,088
Accrued payroll and other liabilities - non-current		29,366
Retained earnings		401,134
Accounting Standards Update 2014-09 \| Effect of Change
Balance Sheet
Deferred income taxes	1,812
Accrued payroll and other liabilities - current	396
Accrued payroll and other liabilities - non-current	5,827
Retained earnings	(4,411)
Income Statement
Income tax expense	257
Accounting Standards Update 2014-09 \| Effect of Change \| Franchise
Income Statement
Revenues	$ (872)
Accounting Standards Update 2014-09 \| Restatement Adjustment
Balance Sheet
Deferred income taxes		1,555		$ 1,555
Accrued payroll and other liabilities - current		339
Accrued payroll and other liabilities - non-current		5,012
Retained earnings		$ (3,796)