Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended				6 Months Ended
	Sep. 07, 2012	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounting Policies [Abstract]
Prior Period Adjustment		$ 6,800,000	$ 6,500,000	$ 6,000,000	$ 5,900,000	$ 12,700,000	$ 11,600,000
Debt and Capital Lease Obligations		228,797,000	240,407,000			228,797,000
Long-term Debt, Fair Value		$ 237,400,000	$ 247,900,000			$ 237,400,000
Stockholders' Equity Note, Stock Split, Conversion Ratio	1.5