Employee Benefits (Employee Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Employee benefit costs	$ 16,112	$ 9,694	$ 5,849
401(k) Matching [Member]
Defined Benefit Plan Disclosure [Line Items]
401(k) matching	2,267	815	700
Deferred Bonus Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Bonus plan costs	445	406	467
Production Bonus Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Bonus plan costs		373	582
Health Benefits, Including Premiums [Member]
Defined Benefit Plan Disclosure [Line Items]
Health benefits, including premiums	$ 13,400	$ 8,100	$ 4,100