Long-Term Debt (Interest Rate Swaps) (Details) (USD $)					3 Months Ended		6 Months Ended
	Jun. 30, 2012 Interest Rate Swap [Member]	Jun. 30, 2011 Interest Rate Swap [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Swap [Member]	Jun. 30, 2011 Swap [Member]	Jun. 30, 2012 Swap [Member]	Jun. 30, 2011 Swap [Member]	Jun. 30, 2012 September 2013 [Member] Interest Rate Swap [Member]	Jun. 30, 2012 October 2013 Thru September 2014 [Member] Interest Rate Swap [Member]	Jun. 30, 2012 October 2014 [Member] Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 200,000,000
Fixed Interest Rate of Swap	1.73%
Quarterly Amortization of Interest Rate Swap Notional Amount									2,500,000	5,000,000	7,500,000
Remaining Balance Of Interest Rate Swap Notional Amount	107,500,000
Derivative Financial Instruments, Liabilities, Fair Value Disclosure			(6,330,000)	(5,078,000)
Interest Rate Swap Unrealized Gain Loss					(690,000)	(3,541,000)	(765,000)	(2,704,000)
Deferred Taxes Pertaining To Other Comprehensive Income Relating to Swaps					$ 500,000	$ 2,400,000	$ 500,000	$ 1,800,000