Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions			9 Months Ended
	May 29, 2015	Mar. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Class of Stock [Line Items]
Stock split, conversion ratio	30
Issuance of common stock in private placement offering		$ 76,000
Consideration received on sale of stock, net of costs		68,200
Stock issuance costs		7,800
Payment of accrued but unpaid interest			$ 2,004	$ 6,710
Amount paid to redeem stock			$ 0	$ 19,000
Capital contribution		36,000
Series C Preferred Stock
Class of Stock [Line Items]
Value of stock redeemed		32,700
Amount paid to redeem stock		19,000
Subordinated debt
Class of Stock [Line Items]
Payment of accrued but unpaid interest		4,900
Secured debt
Class of Stock [Line Items]
Notes payable		10,300
Repayments of notes payable		$ 8,500
Private placement
Class of Stock [Line Items]
Common stock issued (in shares) | shares		6.3
Common stock, par value (in dollars per share) | $ / shares		$ 12.00