Capital Stock - Issuances of Common Stock (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
[CommonClassAMember]
Shares Issued Related To [Line Items]
Directors Compensation	0	91,897	0	242,567
Vesting Incentive Plan Shares	0	0	16,204	0
Total Shares Issued During Period	0	91,897	16,204	242,567
[CommonClassBMember]
Shares Issued Related To [Line Items]
Total Shares Issued During Period	0	0	0	0
[CommonClassCMember]
Shares Issued Related To [Line Items]
Total Shares Issued During Period	0	0	0	0