Debt Maturities Of Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Long-term Debt, by Maturity [Abstract]
Long-term Debt	$ 252,705	$ 252,174
Long-term Debt and Capital Lease Obligations [Abstract]
2012	1,043
2013	1,045
2014	1,047
2015	1,044
2016	604
Thereafter	249,444
Total Payments	254,227
Less: Amount representing estimated executory costs	(1,281)
Less: Amounts representing interest	(241)
Senior Notes [Member] | 250 Million Senior Notes [Member]
Capital Leases, Future Minimum Payments Due [Abstract]
Long Term Debt Maturities Total	249,444
Long-term Debt, by Maturity [Abstract]
2012	0
2013	0
2014	0
2015	0
2016	0
Thereafter	249,444
Long-term Debt	249,444	249,379
Capital Lease Obligations [Member]
Capital Leases, Future Minimum Payments Due [Abstract]
2012	1,024
2013	1,024
2014	1,024
2015	1,024
2016	598
Thereafter	0
Total Payments	4,694
Less: Amount representing estimated executory costs	(1,281)
Capital leases future minimum payments interest costs	(241)
Net principal payments	3,172
Long-term Debt, by Maturity [Abstract]
Long-term Debt	3,172	2,538
Line of Credit [Member] | Revolver [Member]
Long-term Debt, by Maturity [Abstract]
2012	0
2013	0
2014	0
2015	0
2016	0
Thereafter	0
Long-term Debt	0	200
Notes Payable, Other Payables [Member]
Capital Leases, Future Minimum Payments Due [Abstract]
Long Term Debt Maturities Total	89
Long-term Debt, by Maturity [Abstract]
2012	19
2013	21
2014	23
2015	20
2016	6
Thereafter	0
Long-term Debt	$ 89	$ 57