Capital Stock Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	57,836,533
Common stock, shares outstanding, end of period (shares)	55,532,307	57,836,533
Class A Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)		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
Share reclassification (in shares)		(7,167,000)
Common stock, shares outstanding, end of period (shares)			7,167,000
Class B Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	0	51,329,000	52,005,000
Exercise of stock options/stock appreciation rights (shares)	0	29,000	155,000
Director compensation arrangements, net (shares)	0	17,000	13,000
Restricted/performance shares activity, net of forfeitures (shares)	0	122,000	136,000
Acquisition/surrender of shares (shares)	0	(708,000)	(980,000)
Share reclassification (in shares)		(50,789,000)
Common stock, shares outstanding, end of period (shares)	0	0	51,329,000
Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	57,837,000	0	0
Exercise of stock options/stock appreciation rights (shares)	78,000	0	0
Director compensation arrangements, net (shares)	6,000	0	0
Restricted/performance shares activity, net of forfeitures (shares)	98,000	0	0
Acquisition/surrender of shares (shares)	(2,487,000)	(119,000)	0
Share reclassification (in shares)		57,956,000
Common stock, shares outstanding, end of period (shares)	55,532,000	57,837,000	0