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14. Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 43,300    
Finance Lease, Liability, Payments, Remainder of Fiscal Year $ 1,000    
Operating Lease, Weighted Average Remaining Lease Term 9 years    
Finance Lease, Weighted Average Remaining Lease Term 18 years    
Operating Lease, Weighted Average Discount Rate, Percent 4.30%    
Property, Plant and Equipment, gross $ 1,330,536   $ 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 (827,584)   (818,139)
Property, Plant and Equipment, Net 502,952   508,690
Finance Lease, Liability, Current 500    
Finance Lease, Liability, Noncurrent 11,400    
Finance Lease, Liability $ 11,900    
Finance Lease, Weighted Average Discount Rate, Percent 6.50%    
Lessee, Operating Lease, Liability, Payments, Due Year Two $ 37,300    
Finance Lease, Liability, Payments, Due Year Two 1,200    
Lessee, Operating Lease, Liability, Payments, Due Year Three 31,300    
Finance Lease, Liability, Payments, Due Year Three 1,100    
Lessee, Operating Lease, Liability, Payments, Due Year Four 25,300    
Finance Lease, Liability, Payments, Due Year Four 1,100    
Lessee, Operating Lease, Liability, Payments, Due Year Five 23,200    
Finance Lease, Liability, Payments, Due Year Five 1,000    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 123,900    
Finance Lease, Liability, Payments, Due after Year Five 16,100    
Lessee, Operating Lease, Liability, Payments, Due 284,300    
Finance Lease, Liability, Payments, Due 21,500    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (57,300)    
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 (9,600)    
Operating lease right-of-use asset 221,597   0
Operating Lease, Payments 11,700 $ 0  
Operating Lease, Cost 12,400    
Finance Lease, Right-of-Use Asset, Amortization 100    
Finance Lease, Interest Expense 200    
Finance Lease Cost 300    
Sublease Income 700    
Finance Lease, Interest Payment on Liability 200    
Finance Lease, Principal Payments 200    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 1,400    
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0    
Current operating lease liabilities 34,413   0
Operating lease liabilities 192,558   $ 0
Operating Lease, Liability $ 227,000    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 10 years    
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 20 years    
Lessee Operating And Finance Leases Remaining Lease Term 20 years    
GERMANY      
Lessee, Lease, Description [Line Items]      
Unrecorded Unconditional Purchase Obligation $ 5,300    
UNITED STATES      
Lessee, Lease, Description [Line Items]      
Unrecorded Unconditional Purchase Obligation 1,000    
Finance Lease [Member]      
Lessee, Lease, Description [Line Items]      
Property, Plant and Equipment, gross 11,000    
Less: accumulated depreciation and amortization (3,200)    
Property, Plant and Equipment, Net $ 7,800