Subsequent Event (Details) - USD ($) $ in Thousands		9 Months Ended
	Nov. 09, 2015	Sep. 30, 2015
Line Of Credit Facility And Long Term Debt [Line Items]
Minimum net worth financial covenant		$ 240,000
Subsequent Event [Member]
Line Of Credit Facility And Long Term Debt [Line Items]
Minimum net worth financial covenant	$ 170,000
Minimum net worth financial covenant, annual increase	$ 2,000