Consolidated Condensed Statements of Stockholders Equity (Unaudited) (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2010	$ 220	$ 78,428	$ 215,345	$ 1,911	$ 295,904
Balance (in Shares) at Dec. 31, 2010	21,950
Net income			10,289		10,289
Issuance of comm on stock from share-based payment arrangement exercises		137			137
Issuance of comm on stock from share-based payment arrangement exercises (in Shares)	35
Tax benefits from share-based payment arrangement exercises		164			164
Share-based payment arrangement compensation expense		595			595
Dividends on common stock			(878)		(878)
Income before income taxes attributable to noncontrolling interest				390	390
Noncontrolling interest distributions and other, net				131	131
Balance at Jun. 30, 2011	220	79,324	224,756	2,432	306,732
Balance (in Shares) at Jun. 30, 2011	21,985
Net income			13,996		13,996
Share-based payment arrangement compensation expense		754			754
Dividends on common stock			(880)		(880)
Income before income taxes attributable to noncontrolling interest				417	417
Noncontrolling interest distributions and other, net				(660)	(660)
Balance at Dec. 31, 2011	220	80,078	237,872	2,189	320,359
Balance (in Shares) at Dec. 31, 2011	21,985
Net income			13,030		13,030
Issuance of comm on stock from share-based payment arrangement exercises	1	615			616
Issuance of comm on stock from share-based payment arrangement exercises (in Shares)	86
Tax benefits from share-based payment arrangement exercises		350			350
Share-based payment arrangement compensation expense		791			791
Dividends on common stock			(993)		(993)
Income before income taxes attributable to noncontrolling interest				406	406
Noncontrolling interest distributions and other, net				(185)	(185)
Balance at Jun. 30, 2012	$ 221	$ 81,834	$ 249,909	$ 2,410	$ 334,374
Balance (in Shares) at Jun. 30, 2012	22,071