CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Common Stock USD ($)	Additional Paid In Capital USD ($)	Retained Earnings Class A Common Stock USD ($)	Retained Earnings Class B Common Stock USD ($)	Retained Earnings USD ($)	Accumulated Other Comprehensive Income USD ($)	Class A Common Stock USD ($)	Class B Common Stock USD ($)	Total USD ($)
Balance at Dec. 31, 2014			$ 4,904	$ 134,889			$ 414,623	$ 4,315			$ 558,731
Balance (in shares) at Dec. 31, 2014	18,603	2,245
Increase (Decrease) in Stockholders' Equity
Net income							13,788				13,788
Net change in accumulated other comprehensive income								599			599
Dividend declared Common Stock:
Dividend declared Common Stock					(3,481)	(382)			(3,481)	(382)
Stock options exercised, net of shares redeemed			2	182			(65)				119
Stock options exercised, net of shares redeemed (in shares)	8
Net change in notes receivable on Common Stock				(48)							(48)
Deferred director compensation expense - Common Stock				67							67
Deferred director compensation expense - Common Stock (in shares)	5
Stock based compensation - restricted stock				73							73
Stock based compensation expense - options				5							5
Balance at Mar. 31, 2015			$ 4,906	$ 135,168			$ 424,483	$ 4,914			$ 569,471
Balance (in shares) at Mar. 31, 2015	18,616	2,245