Capital and Financing Transactions Notes Payable (Details) (USD $)			3 Months Ended						0 Months Ended		0 Months Ended			0 Months Ended	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2014 Working Capital Revolving Credit Facility PNC Bank	Mar. 31, 2014 Unsecured Revolving Credit Facility Wells Fargo Bank	Mar. 31, 2014 Unsecured Term Loan $125 million Key Bank		Mar. 31, 2014 Unsecured Term Loan $120 million Wells Fargo Bank		Oct. 03, 2012 Unsecured Term Loan Key Bank	Oct. 02, 2012 Unsecured Term Loan Key Bank	Jun. 12, 2013 Term Loan Swap Wells Fargo Bank	Oct. 03, 2012 LIBOR Unsecured Term Loan Key Bank	Oct. 02, 2012 LIBOR Unsecured Term Loan Key Bank	Jun. 12, 2013 LIBOR Term Loan Swap Wells Fargo Bank	Mar. 31, 2014 Minimum LIBOR Unsecured Term Loan $120 million Key Bank	Mar. 31, 2014 Minimum LIBOR Term Loan Swap Wells Fargo Bank	Mar. 31, 2014 Maximum LIBOR Unsecured Term Loan $120 million Key Bank	Mar. 31, 2014 Maximum LIBOR Term Loan Swap Wells Fargo Bank
Debt Instrument [Line Items]
Interest Rate	2.90%	[1]	0.00%	0.00%	2.40%	[2]	3.30%	[3]					0.70%	1.60%
Maturity			Mar. 29, 2016	Mar. 29, 2016	Sep. 27, 2017	[2]	Jun. 11, 2018	[3]
Outstanding Balance	$ 245,000,000		$ 0	$ 0	$ 125,000,000	[2]	$ 120,000,000	[3]
LIBOR												LIBOR		LIBOR
Basis spread on variable rate (in percent)									1.75%		1.70%				1.50%	1.45%	2.25%	2.20%
Interest rate at period end (in percent)										2.45%	3.30%
Notional amount										$ 125,000,000	$ 120,000,000
Term loan swap term (in years)												5 years		5 years

[1] Represents a weighted average interest rate.

[2] Effective October 1, 2012, the Company executed two floating-to-fixed interest rate swaps associated with the Unsecured Term Loan totaling $125 million, locking LIBOR at 0.7% for five years. The loan bears interest at LIBOR plus the applicable spread which ranges between 150 to 225 basis points based on overall Company leverage. The current spread associated with the loan is 1.75% resulting in an all-in rate of 2.45%.

[3] Effective June 12, 2013, the Company entered into a new floating-to-fixed interest rate swap associated with the Term Loan Facility totaling $120 million, locking LIBOR at 1.6% for five years. The loan bears interest at LIBOR plus the applicable spread which ranges between 145 to 220 basis points based on overall Company leverage. The current spread associated with the loan is 1.7% resulting in an all-in rate of 3.3%.