Subsequent Events Subsequent Events (Credit Facility) (Details) (USD $)		3 Months Ended
	Feb. 28, 2014 2014 Credit Facility [Domain]	Mar. 31, 2014 Maximum [Member] 2014 Credit Facility [Domain]	Mar. 31, 2014 Base Rate [Member] 2014 Credit Facility [Domain]	Mar. 31, 2014 Eurodollar Rate [Member] 2014 Credit Facility [Domain]	Mar. 31, 2014 Line of Credit, subfacility [Domain] 2014 Credit Facility [Domain]	Feb. 28, 2014 Line of Credit, subfacility [Member] 2014 Credit Facility [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Initiation Date					Feb. 20, 2014
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000,000					$ 500,000,000
Interest Coverage Ratio		5.0 to 1.0
Conditional acquisition purchase price		$ 50,000,000
Conditional Interest Coverge Ratio		5.5 to 1.0
Percentage Rate			0.50%	1.00%