Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 13, 2016
Compensation and Retirement Disclosure [Abstract]
Projected benefit obligation	$ 28,914	$ 28,914			$ 34,319
Fair value of plan assets	21,345	21,345			$ 22,067
Underfunded status	7,569	7,569
Other post-retirement benefits income (loss)	2,196	2,196	$ (636)	$ (446)
Accumulated other comprehensive income	$ 2,196	$ 2,196	$ 0