Restatement - Summary of Restatement Changes Made to Consolidated Statement of Cash Flows Previously Filed (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016		Sep. 30, 2015
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Gain on disposal of bonds	$ (29,363)	$ (29,363)	[1]
Net cash provided by operating activities		17,623	[1]	$ 50,029
Payments on borrowings		(54,789)	[1]	(93,514)
Net cash provided by financing activities		9,527	[1]	$ 29,991
Originally Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net cash provided by operating activities		46,986
Payments on borrowings		(84,152)
Net cash provided by financing activities		(19,836)
Restatement Adjustment
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Gain on disposal of bonds		(29,363)
Net cash provided by operating activities		(29,363)
Payments on borrowings		29,363
Net cash provided by financing activities		$ 29,363

[1] Restated