Commitments and Contingencies (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) properties $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Number of non-cancelable operating leases | properties	277
Rent expense	$ 37,800	$ 33,100	$ 19,100
Rent income	1,400	$ 512	785
Standby letters of credit that expire within one year	39,800
Standby letters of credit that expire thereafter	25,100
Standby Letters of Credit, Fees	950
Mortgage Loans on Real Estate, Repurchase Reserve Liability	$ 2,200
Litigation settlement other company owned stock			$ 4,400,000
Concentration risk, percentage	78.00%	80.00%
Visa Inc [Member]
Loss Contingencies [Line Items]
Other company stock owned shares | shares	483,806
Conversion ratio from Class B shares into Class A shares	1.6483
Value of the Class A shares (in usd per share) | $ / shares	$ 77.55
Unredeemed Class A equivalent shares owned	$ 61,800