Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounting Standards Update 2015-03 \| Other Assets \| Revolving credit facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs, reclassified	$ 0.2	$ 1.2

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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