Supplemental Cash Flow Information (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share			$ 0.50
Dividends Payable			$ 22,100,000
Income Taxes Paid	$ 135,000	$ 135,000	0
Interest Paid, Net			$ 0
New Jersey Division of Taxation [Member]
Dividends Payable [Line Items]
Income Taxes Paid		$ 1,000