Capital Stock Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	0
Common stock, shares outstanding, end of period (shares)	57,836,533	0
Class A Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	7,167,506	7,167,000	7,167,000
Exercise of stock options/stock appreciation rights (shares)	0	0	0
Director compensation arrangements, net (shares)	0	0	0
Restricted/performance shares activity, net of forfeitures (shares)	0	0	0
Acquisition/surrender of shares (shares)	0	0	0
Conversion of stock, shares converted (shares)	7,167,000
Common stock, shares outstanding, end of period (shares)	0	7,167,506	7,167,000
Class B Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	51,328,974	52,005,000	52,069,000
Exercise of stock options/stock appreciation rights (shares)	29,000	155,000	157,000
Director compensation arrangements, net (shares)	17,000	13,000	16,000
Restricted/performance shares activity, net of forfeitures (shares)	122,000	136,000	138,000
Acquisition/surrender of shares (shares)	(708,000)	(980,000)	(375,000)
Conversion of stock, shares converted (shares)	50,789,000
Common stock, shares outstanding, end of period (shares)	0	51,328,974	52,005,000
Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	0	0	0
Exercise of stock options/stock appreciation rights (shares)		0	0
Director compensation arrangements, net (shares)		0	0
Restricted/performance shares activity, net of forfeitures (shares)		0	0
Acquisition/surrender of shares (shares)	(119,000)	0	0
Conversion of stock, shares converted (shares)	57,956,000
Common stock, shares outstanding, end of period (shares)	57,836,533	0	0