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Derivative Instruments and Hedging Activity (Tables) | 9 Months Ended
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Sep. 30, 2019
Derivative Instruments and Hedging Activity |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (in thousands, except number of instruments): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of Instruments | ​ | Notional
​ | ​ | September 30, | ​ | December 31, | ​ | September 30, | ​ | December 31,
Interest Rate Derivatives |  | 2019 |  | 2018 |  | 2019 |  | 2018
Interest Rate Swap |  | 12 |  | 10 | ​ | $ | 240,000 | ​ | $ | 258,543
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The table below presents the estimated fair value of the Company’s derivative financial instruments, as well as their classification in the condensed consolidated balance sheets (in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset Derivatives
​ | ​ | September 30, 2019 | ​ | December 31, 2018
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | — | ​ | $ | 2,539
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Liability Derivatives
​ | ​ | September 30, 2019 | ​ | December 31, 2018
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | 14,016 | ​ | $ | 1,135
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The table below displays the effect of the Company’s derivative financial instruments in the condensed consolidated statements of income and comprehensive income for the three and nine months ended September 30, 2019 and 2018 (in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Location of | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Income/(Loss) | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Derivatives in | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Reclassified from | ​ | Amount of Income/(Loss)
​ | ​ | Cash Flow | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated OCI | ​ | Reclassified from
​ | ​ | Hedging | ​ | Amount of Income/(Loss) Recognized | ​ | into Income | ​ | Accumulated OCI into Expense
​ | ​ | Relationships | ​ | in OCI on Derivative (Effective Portion) | ​ | (Effective Portion) | ​ | (Effective Portion)
Three Months Ended September 30, |  | ​ |  | 2019 |  | 2018 |  | ​ |  | 2019 |  | 2018
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest rate swaps | ​ | $ | (7,418) | ​ | $ | 454 |  | Interest Expense | ​ | $ | 22 | ​ | $ | 67
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, |  | ​ |  | 2019 |  | 2018 |  | ​ |  | 2019 |  | 2018
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest rate swaps | ​ | $ | (14,617) | ​ | $ | 3,166 | ​ | Interest Expense | ​ | $ | 366 | ​ | $ | (24)
​ ​
Offsetting Assets And Liabilities [Table Text Block] | The table below presents a gross presentation of the effects of offsetting and a net presentation of the Company’s derivatives as of September 30, 2019 and December 31, 2018. The gross amounts of derivative assets or liabilities can be reconciled to the Tabular Disclosure of Fair Values of Derivative Instruments above, which also provides the location that derivative assets and liabilities are presented on the condensed consolidated balance sheets (in thousands): Offsetting of Derivative Assets as of September 30, 2019 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Amounts |  | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Offset in the | ​ | Assets presented | ​ | Gross Amounts Not Offset in the
​ | ​ | Gross Amounts |  | Statement of | ​ | in the Statement | ​ | Statement of Financial Position
​ | ​ | of Recognized | ​ | Financial | ​ | of Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Assets |  | Position |  | Position |  | Instruments |  | Received |  | Net Amount
Derivatives | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ Offsetting of Derivative Liabilities as of September 30, 2019 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross Amounts |  | Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | presented in the |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | Statement of |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Liabilities |  | Position |  | Position |  | Instruments |  | Posted |  | Net Amount
Derivatives | ​ | $ | 14,016 | ​ | $ | — | ​ | $ | 14,016 | ​ | $ | — | ​ | $ | — | ​ | $ | 14,016
​ Offsetting of Derivative Assets as of December 31, 2018 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Amounts | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | Assets presented |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | in the Statement |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | of Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Assets |  | Position |  | Position |  | Instruments |  | Received |  | Net Amount
Derivatives | ​ | $ | 2,539 | ​ | $ | — | ​ | $ | 2,539 | ​ | $ | (575) | ​ | $ | — | ​ | $ | 1,964
​ Offsetting of Derivative Liabilities as of December 31, 2018 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross Amounts |  | Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | presented in the |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | Statement of |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Liabilities |  | Position |  | Position |  | Instruments |  | Posted |  | Net Amount
Derivatives | ​ | $ | 1,135 | ​ | $ | — | ​ | $ | 1,135 | ​ | $ | (575) | ​ | $ | — | ​ | $ | 560

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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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