Stockholders' Equity and Earnings Per Share (Textual) (Details)		12 Months Ended	36 Months Ended
	Oct. 06, 2015 shares	Dec. 31, 2016 USD ($) vote $ / shares shares	Dec. 31, 2016 shares	May 10, 2016 USD ($)	Dec. 31, 2015 shares	Oct. 31, 2015 USD ($)
Class of Stock [Line Items]
Options exercisable, contractual term		4 years
Options granted in period, shares			0
Options outstanding, shares		0	0		0
Stock option
Class of Stock [Line Items]
Options exercisable, expiration date		10 years
Previous Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program authorized amount | $						$ 60,000,000
2016 Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program authorized amount | $				$ 50,000,000
Class A Common Stock
Class of Stock [Line Items]
Votes per share | vote		1
Common stock, shares authorized		25,000,000	25,000,000
Treasury sock, shares		3,007,334	3,007,334		2,950,796
Common stock available for grant, shares		80,701	80,701
Class A Common Stock | Previous Stock Repurchase Program
Class of Stock [Line Items]
Treasury shares acquired	1,122,866
Class A Common Stock | 2016 Stock Repurchase Program
Class of Stock [Line Items]
Treasury shares acquired		109,261
Purchase of shares | $		$ 6,000,000
Average cost per share (in dollars per share) | $ / shares		$ 55.32
Class B Common Stock
Class of Stock [Line Items]
Votes per share | vote		10
Common stock, shares authorized		6,756,176	6,756,176
Common stock available for grant, shares		80,100	80,100