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Debt - Senior Notes - Amendments (Details) - Unsecured Senior Notes - USD ($)	Mar. 31, 2017	Apr. 19, 2018	Dec. 31, 2017	Feb. 01, 2017	Dec. 31, 2016	Apr. 01, 2016	Dec. 31, 2015	Nov. 02, 2015	Apr. 29, 2015
Debt Instrument [Line Items]
Debt covenant, permitted indebtedness				$ 135,000,000		$ 145,000,000		$ 125,000,000
Debt instrument, interest rate						6.50%			5.50%
Consent fee	$ 200,000		$ 200,000		$ 300,000.0	$ 300,000	$ 0
Legal fees	$ 100,000
Subsequent Event
Debt Instrument [Line Items]
Consent fee		$ 300,000
Interest rate if Form 10-K is filed on or before September 30, 2018		7.50%
Interest rate if Form 10-K has not been filed on or before September 30, 2018		8.50%
Interest rate subsequent to Form 10-K filing		7.50%

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- Definition

Debt Instrument, Covenant, Permitted Indebtedness

+ References

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- Definition

Debt Instrument, Interest Rate, Stated Percentage, Form 10-K Filed By Specified Date

+ References

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- Definition

Debt Instrument, Interest Rate, Stated Percentage, Form 10-K Not Filed By Specified Date

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- Definition

Debt Instrument, Interest Rate, Stated Percentage, Subsequent To Form 10-K Filing

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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