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Cash and Cash Equivalents and Fair Value of Financial Instruments - Interest Rate Swap Contracts (Details) - Interest Rate Swap - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Derivative, notional amount | $ 100.0 |
Derivative, fixed interest rate | 0.80% |
Fair value of derivatives | $ 1.4 | $ 1.2
LIBOR |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, variable rate floor | 0.00% |

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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 Fair value of credit risk derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708775-113959 + Details
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