Derivatives - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jan. 31, 2015 USD ($) Counterparty
Derivatives Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax		$ 421,000	$ (4,690,000)	$ (5,212,000)	$ (3,621,000)
Recognized interest expense on derivatives into earnings, net of tax		(301,000)	(570,000)	(946,000)	(926,000)
Warrant
Derivatives Fair Value [Line Items]
Class of warrant exercisable period	3 years
Warrants exercise price | $ / shares	$ 22.50
Fair value derivative, liabilities	$ 1,500,000	100,000		100,000			$ 600,000
Fair value derivative, gain		0		500,000
Warrant | Maximum
Derivatives Fair Value [Line Items]
Common shares issuable upon conversion of warrants | shares	1,250,764
Interest Rate Swaps
Derivatives Fair Value [Line Items]
Derivative notional amount						$ 13,100,000		$ 109,100,000
Number of counterparties | Counterparty								4
Unrealized fair market value gain (loss)				7,900,000
Unrealized gain (loss) on derivatives, net of tax		400,000	(4,700,000)	(5,200,000)	(3,600,000)
Unrealized gain (loss) on derivatives, tax benefit		300,000	900,000	3,300,000	0
Recognized interest expense on derivatives into earnings, net of tax		300,000	600,000	900,000	900,000
Recognized interest expense on derivatives into earnings, tax expense (benefit)		200,000	$ 0	600,000	$ 0
Additional amount to be classified as an increase to interest expense during next 12 months		$ 1,700,000		$ 1,700,000