Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Trade payables	$ 109,222	$ 85,038
Accrued workers’ compensation liabilities	30,642	30,585
Accrued payroll	17,104	12,238
Accrued bonus	20,729	17,335
Accrued vacation and long service leave	16,403	14,988
Accrued health benefits	13,020	10,987
Accrued property taxes	20,370	14,376
Accrued utilities	7,854	6,274
New market tax credit deferred contribution liability	4,882	0
Income taxes payable	997	290
Dividends payable	39,753	28,540
Accrued interest	24,872	4,843
Other accrued expenses	45,115	27,586
Accounts payable and accrued expenses	$ 350,963	$ 253,080