Capital Stock - (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capital Stock [Roll Forward]
Treasury Shares, Beginning Balance	(3,194,000)	(3,187,000)	(3,158,000)
Exercise of stock options	1,250	172,218	33,810
Treasury Shares, Ending Balance	(3,616,000)	(3,194,000)	(3,187,000)
Number of stock awards canceled	110,562	94,781	77,591
Treasury Stock, Shares, Acquired	(5,000,000)
Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities	(5,000)	(351,000)
Capital Stock [Roll Forward]
Common Stock, Beginning Balance	35,024,000	34,219,000	34,084,000
Exercise of stock options	1,000	172,000	34,000
Restricted stock awards	288,000	282,000	101,000
Common Stock, Ending Balance	35,318,000	35,024,000	34,219,000
Dividends declared (in dollars per share)	$ 0.05	$ 0.05	$ 0.05
Dividends paid (in dollars per share)	$ 0.05	$ 0.05	$ 0.05
Treasury Stock, Shares, Acquired	0
Dividends	$ 0.05
Class B Common Shares
Class of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities	(5,000)	(351,000)
Capital Stock [Roll Forward]
Common Stock, Beginning Balance	734,000	1,085,000	1,085,000
Exercise of stock options	0	0	0
Restricted stock awards	0	0	0
Common Stock, Ending Balance	729,000	734,000	1,085,000
Dividends declared (in dollars per share)	$ 0.045	$ 0.045	$ 0.045
Dividends paid (in dollars per share)	$ 0.045	$ 0.045	$ 0.045
Treasury Stock, Shares, Acquired	0
Dividends	$ 0.045
Treasury Shares
Class of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	0
Capital Stock [Roll Forward]
Exercise of stock options	0	0	0
Restricted stock awards	(32,000)	(7,000)	(29,000)
Treasury Stock, Shares, Acquired	(390,000)