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14. Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Unrecorded Unconditional Purchase Obligation $ 15,500 $ 15,500  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 21,900 21,900  
Finance Lease, Liability, Payments, Remainder of Fiscal Year $ 700 $ 700  
Operating Lease, Weighted Average Remaining Lease Term 9 years 9 years  
Finance Lease, Weighted Average Remaining Lease Term 18 years 18 years  
Operating Lease, Weighted Average Discount Rate, Percent 4.30% 4.30%  
Property, plant and equipment, gross $ 1,349,435 $ 1,349,435 $ 1,326,829
Operating Leases, Future Minimum Payments Due, Next Twelve Months     44,400
Operating Leases, Future Minimum Payments, Due in Two Years     37,800
Operating Leases, Future Minimum Payments, Due in Three Years     27,400
Operating Leases, Future Minimum Payments, Due in Four Years     19,700
Operating Leases, Future Minimum Payments, Due in Five Years     13,900
Operating Leases, Future Minimum Payments, Due Thereafter     25,600
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals     17,800
Less: accumulated depreciation and amortization (850,255) (850,255) (818,139)
Property, plant and equipment, net 499,180 499,180 508,690
Finance Lease, Liability, Current 500 500  
Finance Lease, Liability, Noncurrent 11,300 11,300  
Finance Lease, Liability $ 11,800 $ 11,800  
Finance Lease, Weighted Average Discount Rate, Percent 6.50% 6.50%  
Lessee, Operating Lease, Liability, Payments, Due Year Two $ 39,200 $ 39,200  
Finance Lease, Liability, Payments, Due Year Two 1,300 1,300  
Lessee, Operating Lease, Liability, Payments, Due Year Three 33,500 33,500  
Finance Lease, Liability, Payments, Due Year Three 1,200 1,200  
Lessee, Operating Lease, Liability, Payments, Due Year Four 26,200 26,200  
Finance Lease, Liability, Payments, Due Year Four 1,100 1,100  
Lessee, Operating Lease, Liability, Payments, Due Year Five 22,700 22,700  
Finance Lease, Liability, Payments, Due Year Five 1,100 1,100  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 132,000 132,000  
Finance Lease, Liability, Payments, Due after Year Five 16,200 16,200  
Lessee, Operating Lease, Liability, Payments, Due 275,500 275,500  
Finance Lease, Liability, Payment, Due 21,600 21,600  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (53,900) (53,900)  
Capital Leases, Future Minimum Payments Due, Next Twelve Months     500
Capital Leases, Future Minimum Payments Due in Two Years     200
Capital Leases, Future Minimum Payments Due in Three Years     500
Capital Leases, Future Minimum Payments Due in Four Years     400
Capital Leases, Future Minimum Payments Due in Five Years     400
Capital Leases, Future Minimum Payments Due Thereafter     9,900
Finance Lease, Liability, Undiscounted Excess Amount (9,800) (9,800)  
Operating lease right-of-use assets 215,507 215,507 0
Operating Lease, Payments 11,300 22,900  
Operating Lease, Cost 12,100 24,500  
Finance Lease, Right-of-Use Asset, Amortization 200 400  
Finance Lease, Interest Expense 300 500  
Finance Lease Cost 500 900  
Sublease Income 700 1,500  
Finance Lease, Interest Payment on Liability 300 500  
Finance Lease, Principal Payments 100 400  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 4,500 5,800  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability   0  
Current operating lease liabilities 33,933 33,933 0
Operating lease liabilities 187,691 187,691 $ 0
Operating Lease, Liability $ 221,600 $ 221,600  
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 2 years 6 months 2 years 6 months  
Lessee Operating And Finance Leases Remaining Lease Term   1 year  
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 10 years 10 years  
Lessee Operating And Finance Leases Remaining Lease Term   20 years  
Finance Lease [Member]      
Lessee, Lease, Description [Line Items]      
Property, plant and equipment, gross $ 11,400 $ 11,400  
Less: accumulated depreciation and amortization (3,900) (3,900)  
Property, plant and equipment, net $ 7,500 $ 7,500