Significant Accounting Policies (Investments) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Investment [Line Items]
Company owned life insurance	$ 2,000,000		$ 2,000,000
Payments to acquire life insurance policies			5,000,000
Cash surrender value of life insurance	5,783,000		5,783,000		5,931,000
Increase in cash surrender value of company owned life insurance	198,000	(54,000)	148,000	(171,000)
Proceeds from life insurance policies			$ 0		$ 0
Private Equity Funds [Member] | Maximum [Member]
Investment [Line Items]
Investment owned, percent of net assets	1.00%		1.00%