Funds Received From Sale Of Income Tax Net Operating Losses (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Funds received from sale of income tax net operating losses	$ 1,374	$ 0	$ 0	$ 1,374	$ 1,126
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						$ 151,000
Pennsylvania [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						36,000
New Jersey [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						$ 28,000
Operating loss carryforwards, amount of NOL carryforwards sold	$ 14,291