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Financial Instruments and Fair Values - Terms of Agreements and Fair Value (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset | $ 614,000 | $ 0
Liability | (5,591,000) | (1,922,000)
LIBOR [Member] | Interest Rate Swap, One Month LIBOR, 2.1485% [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 265,000,000 |
Pay Rate | 2.1485% |
Asset | $ 0 | 0
Liability | (1,634,000) | (1,620,000)
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.5050% [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 100,000,000 |
Pay Rate | 2.505% |
Asset | $ 0 | 0
Liability | (684,000) | (148,000)
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 100,000,000 |
Pay Rate | 2.505% |
Asset | $ 0 | 0
Liability | (685,000) | (154,000)
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860% [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 100,000,000 |
Pay Rate | 2.486% |
Asset | $ 224,000 | 0
Liability | 0 | 0
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860%, 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 100,000,000 |
Pay Rate | 2.486% |
Asset | $ 223,000 | 0
Liability | 0 | 0
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860%, 3 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 75,000,000 |
Pay Rate | 2.486% |
Asset | $ 167,000 | 0
Liability | 0 | 0
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.7620% [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 75,000,000 |
Pay Rate | 2.762% |
Asset | $ 0 | 0
Liability | (1,295,000) | 0
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.7620%, 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 75,000,000 |
Pay Rate | 2.762% |
Asset | $ 0 | 0
Liability | $ (1,293,000) | $ 0

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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