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Debt - Senior Notes - Narrative (Details) - USD ($)	Mar. 31, 2017	Apr. 29, 2015	Dec. 31, 2017	Dec. 31, 2016	Apr. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt financing costs			$ 900,000	$ 17,200,000		$ 1,500,000	$ 200,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate		5.50%			6.50%
Purchase price percentage if debt covenants are not certified		100.00%
Legal fees	$ 100,000
Consent fee	$ 200,000		200,000	300,000.0	$ 300,000	0
Unsecured Senior Notes | 5.50% Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 55,000,000.0
Debt instrument, interest rate		5.50%
Proceeds from issuance of long-term debt		$ 53,500,000
Debt financing costs		$ 1,500,000
Accrued unpaid interest			$ 600,000	$ 600,000		$ 500,000
Unsecured Senior Notes | 5.50% Senior Notes | Before May 1, 2016
Debt Instrument [Line Items]
Redemption price, percentage		101.00%
Unsecured Senior Notes | 5.50% Senior Notes | May 1, 2016 through October 31, 2016
Debt Instrument [Line Items]
Redemption price, percentage		101.00%

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