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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) |  |

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