Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended			3 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Nov. 30, 2012 Term A Facility [Member]	Jul. 31, 2012 Term A Facility [Member]	Mar. 31, 2012 Term A Facility [Member]	Sep. 30, 2012 Term A Facility [Member]	Sep. 30, 2012 Term A Facility [Member]	Sep. 30, 2014 Next Quarterly Installment Under Term A Facility September 30, 2014 [Member]	Sep. 30, 2012 Senior Notes Due July 15, 2021 [Member]
Debt Instrument [Line Items]
Voluntary payment on credit facility					$ 50,000,000	$ 50,000,000	$ 50,000,000
Write-off of deferred financing costs	334,000	0	646,000	5,703,000				334,000	646,000
Line of credit facility periodic payment										4,250,000
Face amount of senior notes											$ 700,000,000
Interest rate	8.625%		8.625%								7.75%
Maturity date of senior notes											Jul. 15, 2021