Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, percentage		6.00%
Total plan contributions		$ 3,200	$ 1,400	$ 1,200
Plan amendments	$ 3,067
Recognized Net gain (loss) due curtailments		$ 3,100
Minimum
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, percentage		0.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, percentage		100.00%