Defined Contribution Plan (Narrative) (Details) - USD ($)	6 Months Ended		12 Months Ended				24 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
Defined Contribution Plan [Abstract]
Condition to participate in defined contribution plan			Employees have the opportunity to participate following completion of three months of employment and must be 21 years of age.
Discretionary matching contribution company percentage	75.00%	50.00%				50.00%	75.00%
Discretionary matching contribution, employee's contribution, maximum	$ 4,000	$ 3,000				$ 3,000	$ 4,000
Company matching contributions			$ 2,100,000	$ 2,000,000	$ 1,600,000