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Derivative (Tables) | 6 Months Ended
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Jun. 30, 2019
Derivatives [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] |
|  |  | June 30, 2019
|  |  | Notional Amount |  | Fair Value (a)
Derivatives designated as hedging instruments under ASC 815 | Balance sheet classification |  | (in thousands)
Interest rate swaps | Other assets (long term liabilities) | $ | 31,591 |  | $ | (628)
|  |  | December 31, 2018
|  |  | Notional Amount |  | Fair Value (a)
Derivatives designated as hedging instruments under ASC 815 | Balance sheet classification |  | (in thousands)
Interest rate swaps | Other assets (long term liabilities) | $ | 34,090 |  | $ | (170)
| (a) See Note 16 for the fair value measurements related to these financial instruments.
Schedule of Cash Flow Hedges Included in AOCI [Table Text Block] |
Derivatives in Hedging Relationships |  | Amount of gain (loss) recognized in OCI on derivative (effective portion)
|  | Three months ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (in thousands)
Interest rate swaps |  | $ | (298) |  | $ | 155 |  | $ | (494) |  | $ | (99)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
Details about AOCI Components |  |  | Amount reclassified from AOCI into income (effective portion) |  |  |  |  |
| Three Months Ended |  | Six Months Ended |  | Location of amount reclassified from AOCI
| June 30, |  | June 30, |
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | into income (effective portion)
| (in thousands) |  |
Interest rate swaps | $ | 19 |  | $ | 70 |  | $ | 36 |  | $ | 45 |  | Interest expense

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- Definition Tabular disclosure of gain (loss) on derivative and nonderivative instruments designated and qualifying as cash flow hedge recorded in accumulated other comprehensive income (AOCI) and reclassified into earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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