Stockholders' Equity and Earnings Per Share (Textual) (Details)		12 Months Ended	25 Months Ended
	Oct. 06, 2015 USD ($) shares	Dec. 31, 2015 vote $ / shares shares	Nov. 30, 2013 USD ($) shares	Dec. 31, 2014 shares	Nov. 12, 2013 USD ($)
Class of Stock [Line Items]
Options exercisable, contractual term		4 years
Options granted in period, shares		0
Options outstanding, shares		0		0
Stock option
Class of Stock [Line Items]
Options exercisable, expiration date		10 years
Shares Outstanding Class A
Class of Stock [Line Items]
Votes per share | vote		1
Common stock, shares authorized		25,000,000
Treasury sock, shares		2,950,796		2,548,336
Common stock available for grant, shares		80,701
Shares Outstanding Class A | 2013 Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program authorized amount | $					$ 60,000,000
Treasury shares acquired	1,122,866	442,853
Purchase of shares | $	$ 60,000,000
Average cost per share (in dollars per share) | $ / shares		$ 54.22
Shares Outstanding Class A | 2011 and 2013 Stock Repurchase Program
Class of Stock [Line Items]
Treasury shares acquired			624,000
Purchase of shares | $			$ 35,600,000
Shares Outstanding Class B
Class of Stock [Line Items]
Votes per share | vote		10
Common stock, shares authorized		6,756,176
Common stock available for grant, shares		80,100