Accounting for Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of changes in outstanding stock options

	Shares			Weighted- Average Exercise Price		Aggregate Intrinsic Value (in  thousands)
Outstanding at January 1, 2010		312,973		$	12.12	$	4,594
Exercised		(110,237	)	$	8.76	$	(1,870	)
Granted		196,133		$	24.44	$	251
Forfeited/Expired		(6,500	)	$	6.16	$	(127	)
Outstanding at December 31, 2010		392,369		$	19.32	$	2,511
Exercised		(39,487	)	$	12.11	$	(500	)
Granted		190,552		$	21.77	$	574
Forfeited/Expired		(82,781	)	$	21.85	$	(243	)
Outstanding at December 31, 2011		460,653		$	20.50	$	1,972
Exercised		(11,521	)	$	6.73	$	(193	)
Granted		203,436		$	25.39	$	0
Forfeited/Expired		(13,768	)	$	24.58	$	(0	)
Outstanding at December 31, 2012		638,800		$	22.21	$	786
Vested plus expected to vest at December 31, 2012		625,762		$	22.16	$	801
Exercisable at December 31, 2012		293,896		$	19.92	$	1,035

Stock options outstanding

	OPTIONS OUTSTANDING						OPTIONS EXERCISABLE
Range of Exercise Prices	Number Outstanding As of 12/31/12		Weighted Average Remaining Contractual Term		Weighted Average Exercise Price		Number Exercisable As of 12/31/12		Weighted Average Exercise Price
$  7.01 – $10.00		27,500		2.53	$	8.24		27,500	$	8.24
$18.01 – $23.00		305,749		6.62	$	20.37		181,368	$	19.39
$23.01 – $26.00		305,551		8.32	$	25.32		85,028	$	24.84
$ 7.01 to $26.00		638,800		7.26	$	22.21		293,896	$	19.92

Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of the Company's restricted stock awards

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in  thousands)
Non-vested restricted stock awards at January 1, 2010		6,794		$	21.20	$	182
Granted		20,002		$	24.38	$	514
Vested		(23,400	)	$	23.92	$	(601	)
Non-vested restricted stock awards at December 31, 2010		3,396		$	21.19	$	87
Granted		48,356		$	24.32	$	1,198
Vested		(17,088	)	$	23.87	$	(423	)
Non-vested restricted stock awards at December 31, 2011		34,664		$	24.23	$	859
Granted		36,139		$	22.41	$	847
Vested		(34,664	)	$	24.23	$	(813	)
Non-vested restricted stock awards at December 31, 2012		36,139		$	22.41	$	847

Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of the Company's restricted stock units

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Non-vested restricted stock units at January 1, 2010		486,017		$	15.48	$	13,025
Granted		423,092		$	24.90	$	10,882
Vested		(206,400	)	$	24.62	$	(5,298	)
Cancelled		(50,385	)	$	25.64	$	(1,296	)
Non-vested restricted stock units at December 31, 2010		653,324		$	25.05	$	16,803
Granted		350,375		$	21.69	$	8,682
Vested		(176,251	)	$	22.56	$	(4,367	)
Cancelled		(58,429	)	$	24.01	$	(1,448	)
Non-vested restricted stock units at December 31, 2011		769,019		$	23.67	$	19,056
Granted		374,868		$	25.42	$	8,787
Vested		(230,632	)	$	24.66	$	(5,406	)
Cancelled		(64,664	)	$	24.24	$	(1,516	)
Non-vested restricted stock units at December 31, 2012		848,591		$	24.32	$	19,891
Restricted stock units expected to vest in the future		805,179		$	23.44	$	18,873