Long-Term Debt (Interest Rate Swaps) (Details) (Interest Rate Swap [Member], USD $)				3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 September 2013 [Member]	Jun. 30, 2014 December 2018 [Domain]
Derivative [Line Items]
Derivative, Notional Amount	$ 500,000,000
Derivative Financial Instruments, Liabilities, Fair Value Disclosure		(991,000)	(4,020,000)
Market value adjustments on interest rate swap, net of tax				(612,000)	694,000	(684,000)	1,248,000
Deferred Taxes Pertaining To Other Comprehensive Income Relating to Swaps				(400,000)	400,000	400,000	(800,000)
Derivative, Fixed Interest Rate	1.57%
Quarterly Amortization of Interest Rate Swap Notional Amount								12,500,000	25,000,000
Remaining Balance Of Interest Rate Swap Notional Amount	$ 250,000,000