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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 |  |

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