Employee Benefits (Employee Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Employee benefit costs	$ 14,718	$ 16,112	$ 9,694
401(k) Matching [Member]
Defined Benefit Plan Disclosure [Line Items]
401(k) matching	1,458	2,267	815
Deferred Bonus Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Bonus plan	588	445	406
Production Bonus Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Bonus plan			373
Health Benefits, Including Premiums [Member]
Defined Benefit Plan Disclosure [Line Items]
Health benefits, including premiums	$ 12,672	$ 13,400	$ 8,100