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Interest Rate Derivatives (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair value of interest rate derivatives and balance sheet classification |  |  |  |
Interest rate swaps designated as cash flow hedges |  | $ 3,073 | $ 158 |
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |
Unrealized gain (loss) recognized in AOCL (effective portion) |  | 684 | (2,915) | $ (4,739)
Interest rate swaps |  |  |  |
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |
Unrealized gain (loss) recognized in AOCL (effective portion) |  | 684 | (2,915) | (4,739)
Approximate amount of losses to be reclassified from AOCL to interest expense over the next 12 months |  | 460 |  |
Interest rate swaps | Interest expense [Member] |  |  |  |
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |
Loss reclassified from AOCL into interest expense (effective portion) |  | (3,216) | (4,230) | (3,599)
Gain (loss) on derivatives recognized in interest expense (ineffective portion) |  | 323 | 378 | (386)
Loss reclassified from AOCL into interest expense (ineffective portion) |  | (88) | 0 | $ 0
Interest rate swaps | Prepaid expenses and other assets [Member] |  |  |  |
Fair value of interest rate derivatives and balance sheet classification |  |  |  |
Interest rate swaps designated as cash flow hedges |  | 3,073 | 158 |
Interest rate swaps | Other liabilities [Member] |  |  |  |
Fair value of interest rate derivatives and balance sheet classification |  |  |  |
Interest rate swaps designated as cash flow hedges |  | 0 | (1,572) |
Designated [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Fair value of interest rate swaps |  | 3,073 | (1,414) |
Designated [Member] | Interest rate swap, effective date September 1, 2015, swap two [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 100,000 |  |
Fixed Rate (as a percent) |  | 1.73% |  |
Fair value of interest rate swaps |  | $ 252 | (848) |
Designated [Member] | Interest rate swap, effective October 13, 2015 [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 13,217 |  |
Fixed Rate (as a percent) |  | 1.39% |  |
Fair value of interest rate swaps |  | $ 213 | 100 |
Notional amount after scheduled amortization |  | 12,100 |  |
Designated [Member] | Interest rate swap, effective September 1, 2016, swap one [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 100,000 |  |
Fixed Rate (as a percent) |  | 1.9013% |  |
Fair value of interest rate swaps |  | $ 1,046 | (23) |
Designated [Member] | Interest rate swap, effective September 1, 2016, swap two [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 100,000 |  |
Fixed Rate (as a percent) |  | 1.905% |  |
Fair value of interest rate swaps |  | $ 1,051 | 48 |
Designated [Member] | Interest rate swap, effective September 1, 2016, swap three [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 50,000 |  |
Fixed Rate (as a percent) |  | 1.9079% |  |
Fair value of interest rate swaps |  | $ 511 | 10 |
Designated [Member] | Interest rate swap, effective date September 1, 2015, swap one [Member] |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |
Notional Amount |  | $ 100,000 |  |
Fixed Rate (as a percent) |  | 1.673% |  |
Fair value of interest rate swaps |  | $ 0 | $ (701) |
Interest rate swap cash settled | $ 460 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Ineffective Portion + References No definition available. + Details
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- Definition Represents the notional amount of interest rate derivatives after scheduled amortization. + References No definition available. + Details
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- Definition The premium (cost) of a hedge, net of any cash received on settlement during the period. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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