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Leases Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense are as follows (dollars in thousands):
|  | Three Months Ended March 31, 2019
Operating lease cost |  | $ | 2,470 |
Short-term, variable and other lease costs |  | 600 |
Total lease cost |  | $ | 3,070 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Maturities of lease liabilities are as follows (dollars in thousands):
Year ended December 31, |  | Operating Leases(a)
2019 (excluding the three months ended March 31, 2019) |  | $ | 7,310 |
2020 |  | 9,060 |
2021 |  | 7,440 |
2022 |  | 4,920 |
2023 |  | 4,000 |
Thereafter |  | 12,450 |
Total lease payments |  | 45,180 |
Less: Imputed interest |  | (6,550 | )
Present value of lease liabilities |  | $ | 38,630 |
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(a) | The maturity table excludes cash flows associated with exited lease facilities. Liabilities for exited lease facilities are included in Accrued liabilities and Other long-term liabilities in the accompanying consolidated balance sheet.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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