Equity-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Realized tax benefits related to compensation cost	$ 0	$ 0	$ 0
Proceeds from Issuance of Common Stock	1,430,000	2,156,000	1,839,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outandsing Stock Options, Date Fully Exercisable After	2 years
Outstanding Stock Options, Number of Years Expiration Date is No Later Than	10 years
Unvested stock options outstanding (in shares)	0	0	0
Proceeds from Issuance of Common Stock	1,430,000	2,156,000	1,839,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0	0	0
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	4,100,000
Weighted average period (in years)	1.5
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 700,000
Weighted average period (in years)	1
Minimum [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	0.00%
Maximum [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	200.00%