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Long-Term Debt (Narrative) (Details) (USD $)						6 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jul. 31, 2004 Senior Notes [Member] Private Placement [Member]	Dec. 31, 2010 Repayment of Debt [Member]	Jun. 30, 2011 Repayment of Debt [Member] Private Placement [Member]	Jun. 30, 2011 Acquisition Notes Payable	Jun. 30, 2011 Master Agreement [Member]	Dec. 31, 2010 Master Agreement [Member]	Dec. 22, 2006 Master Agreement [Member] Series C [Member]	Jun. 30, 2011 Master Agreement [Member] Series C [Member]	Feb. 01, 2008 Master Agreement [Member] Series D [Member]	Jun. 30, 2011 Master Agreement [Member] Series D [Member]	Jun. 30, 2011 Master Agreement [Member] Series E [Member]	Jun. 30, 2011 Line of Credit [Member]	Dec. 31, 2010 Line of Credit [Member]	Jun. 30, 2011 LIBOR [Member]	Dec. 31, 2009 LIBOR [Member]	Jun. 30, 2011 Series A [Member] Private Placement [Member]	Jun. 30, 2011 Series B [Member] Private Placement [Member]
Maximum shelf facility capacity							$ 200,000,000
Unsecured senior notes outstanding	250,000,000	250,000,000	200,000,000	200,000,000	200,000,000		50,000,000	50,000,000		25,000,000		25,000,000	100,000,000					100,000,000	100,000,000
Long-term debt, maturities, repayment terms							ten
Debt Instrument, Issuance Date										December 22, 2006		February 1, 2008	September 15, 2011					September 15, 2004	July 15,2004
Debt Instrument, Maturity Date									Dec. 22, 2006		Jan. 15, 2015		Sep. 15, 2018					Sep. 15, 2011	Jul. 15, 2014
Debt Instrument Interest Rate Stated Percentage										5.66%		5.37%	4.50%					5.57%	6.08%
Line of credit facility, amount outstanding														0	0
Lending commitment amount														50,000,000
Increase in lending commitment amount, potential														100,000,000
Previous maximum principal amount														75,000,000
Previous reduced maximum capacity														20,000,000
Availability fees, minimum														0.10%
Availability fees, maximum														0.20%
Letter of credit usage fee, minimum														0.50%
Letter of credit usage fee, maximum														1.00%
Ninety-day LIBOR rate																0.246%	0.30%
LIBOR below base rate														1.00%
Interest rate, minimum						0.00%								0.50%
Interest rate, maximum						4.00%								1.00%
Additional borrowings														$ 0	$ 0

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