Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information

	Year Ended December 31,
	2012		2011		2010
Cash paid during the year for:
Interest	$	2,069	$	2,395	$	2,681
Income taxes	$	3,000	$	4,529	$	3,956

Schedule of the entity's financial liabilities measured at fair value on a recurring basis

• 	Fair Value Measurements as of December 31,
  							Significant Other Observable Inputs (Level 2)
  	2012			2011			2012			2011			Valuation Technique
  Interest rate swap liabilities	$	(2,629	)	$	(3,486	)	$	(2,629	)	$	(3,486	)	Cash flows approach

Schedule of additions and write-offs to the Company's allowance for doubtful accounts

• 	2012			2011
  Beginning balance	$	429		$	360
  Additions		105			91
  Write-offs		(9	)		(22	)
  Ending balance	$	525		$	429

Summary of inventories

• 	December 31,
  	2012		2011
  Lime and limestone inventories:
  Raw materials	$	6,718	$	3,540
  Finished goods		2,328		2,107
  	$	9,046	$	5,647
  Service parts inventories		5,081		5,117
  	$	14,127	$	10,764

Schedule of estimated useful lives of property, plant and equipment

• Buildings and building improvements	3 - 20 years
  Machinery and equipment	2 - 20 years
  Furniture and fixtures	3 - 10 years
  Automotive equipment	3 - 10 years

Schedule of other assets

• 	December 31,
  	2012		2011
  Intangible assets	$	—	$	7
  Deferred financing costs		136		181
  Other		109		114
  	$	245	$	302

Schedule of computation of basic and diluted income per common share

• 	Year Ended December 31,
  	2012		2011		2010
  Net income for basic and diluted income per common share	$	16,423	$	22,186	$	18,040
  Weighted-average shares for basic income per common share		5,705,475		6,343,992		6,400,958
  Effect of dilutive securities:
  Employee and director stock options(1)		10,286		18,449		16,859
  Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,715,761		6,362,441		6,417,817
  Basic net income per common share	$	2.88	$	3.50	$	2.82
  Diluted net income per common share	$	2.87	$	3.49	$	2.81

(1)

Excludes 17,400, 7,500 and 9,500 stock options in 2012, 2011 and 2010, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.