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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Taxes  
Schedule of components of provision (benefit) for income taxes
Years ended December 31, 2018  2017  2016 
(in thousands)         
Current provision (benefit):            
Federal $13,708  $95,995  $(43,993)
State  3,932   13,966   (24,479)
Foreign  6,843   2,953   4,567 
Deferred provision (benefit):            
Federal  23,203   (39,710)  (31,505)
State  (1,808)  (2,899)  (2,704)
Total income tax provision (benefit) $45,878  $70,305  $(98,114)
Schedule of reconciliation between the federal statutory rate and effective tax rate
Years ended December 31, 2018  2017  2016 
Federal statutory rate  21.0%  35.0%  35.0%
State income taxes, net of federal benefit  2.6   1.9   1.3 
Tax credits  (0.1)  (0.7)  0.1 
Non-deductible expenses  1.8   2.0   (0.7)
Change in contingencies        6.6 
Adjustments related to the Act  (2.3)  (8.3)   
Adjustments related to vesting of restricted stock  (0.8)  (1.2)   
Other  (1.5)  1.5   (1.3)
Effective tax rate  20.7%  30.2%  41.0%
Schedule of deferred tax assets and liabilities
December 31, 2018  2017 
(in thousands)      
Deferred tax assets:        
Self-insurance $5,055  $4,660 
Pension  7,261   8,730 
State net operating loss carryforwards  1,663   4,048 
Bad debt  1,291   1,149 
Accrued payroll  1,416   1,117 
Stock-based compensation  3,501   3,612 
Foreign tax credits     3,592 
All others  3,166   1,681 
Valuation allowance  (445)  (3,994)
Gross deferred tax assets  22,908   24,595 
Deferred tax liabilities:        
Depreciation  (71,647)  (53,119)
Goodwill amortization  (6,587)  (6,450)
Basis differences in consolidated limited liability company  (4,636)  (4,102)
Basis differences in joint ventures  (408)  (355)
All others  (5)  (6)
Gross deferred tax liabilities  (83,283)  (64,032)
Net deferred tax liabilities $(60,375) $(39,437)
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits
  2018  2017 
Balance at January 1 $2,215,000  $2,215,000 
Additions based on tax positions related to the current year      
Additions for tax positions of prior years      
Reductions for tax positions of prior years      
Balance at December 31 $2,215,000  $2,215,000