CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock	Additional Paid-in Capital	Retained Earnings	Non Controlling Interest	Total
Balance at Dec. 31, 2011	$ 5,000	$ 150,003,000	$ 124,924,000		$ 274,932,000
Balance (in shares) at Dec. 31, 2011	51,059,132
Increase (Decrease) in Stockholders' Equity Roll Forward
Net income			56,756,000	1,511,000	58,267,000
Issuance of shares to employees and directors		2,173,000			2,173,000
Issuance of shares to employees and directors (in shares)	139,465
Issuance of shares to sellers of Sprint		980,000			980,000
Issuance of shares to sellers of Sprint (in shares)	62,052
Issuance of earnout shares to Rockford sellers		3,450,000			3,450,000
Issuance of earnout shares to Rockford sellers (in shares)	232,637
Dividends			(6,163,000)		(6,163,000)
Repurchase of stock		(1,001,000)			(1,001,000)
Repurchase of stock (in shares)	(89,600)
Balance at Dec. 31, 2012	5,000	155,605,000	175,517,000	1,511,000	332,638,000
Balance (in shares) at Dec. 31, 2012	51,403,686
Increase (Decrease) in Stockholders' Equity Roll Forward
Net income			69,660,000	5,020,000	74,680,000
Issuance of shares to employees and directors		3,062,000			3,062,000
Issuance of shares to employees and directors (in shares)	153,579
Dividends			(6,961,000)		(6,961,000)
Amortization of Restricted Stock Units		366,000			366,000
Issuance of shares as part of Q3C acquisition		463,000			463,000
Issuance of shares as part of Q3C acquisition (in shares)	29,273
Cancelled shares for redemption of note receivable		(300,000)			(300,000)
Cancelled shares for redemption of note receivable (in shares)	(15,144)
Distribution of non-controlling entities				(5,500,000)	(5,500,000)
Balance at Dec. 31, 2013	5,000	159,196,000	238,216,000	1,031,000	398,448,000
Balance (in shares) at Dec. 31, 2013	51,571,394
Increase (Decrease) in Stockholders' Equity Roll Forward
Net income			63,156,000	526,000	63,682,000
Issuance of shares to employees and directors		2,897,000			2,897,000
Issuance of shares to employees and directors (in shares)	90,002
Dividends			(7,741,000)		(7,741,000)
Repurchase of stock		(2,844,000)			(2,844,000)
Repurchase of stock (in shares)	(100,000)
Amortization of Restricted Stock Units		934,000			934,000
Dividend equivalent Units accrued - Restricted Stock Units		3,000	(3,000)
Distribution of non-controlling entities				(1,590,000)	(1,590,000)
Balance at Dec. 31, 2014	$ 5,000	$ 160,186,000	$ 293,628,000	$ (33,000)	$ 453,786,000
Balance (in shares) at Dec. 31, 2014	51,561,396