Business combinations: (Tables)

12 Months Ended

Dec. 31, 2012

Emer

Business combinations

Schedule of fair value of the assets acquired and liabilities assumed

Consideration allocated to:
Property, plant and equipment	$	17,644
Other tangible assets, including cash of $11,073	60,532
Intangible assets subject to amortization over 5 to 20 years	32,954
Goodwill	50,774
Total assets acquired	161,904
Less:
Long-term debt	(83,272		)
Other liabilities	(38,926		)
Total net assets acquired	$	39,706
Consideration:
Cash	$	17,607
Common shares	22,099
	$	39,706

AFV

Business combinations

Schedule of fair value of the assets acquired and liabilities assumed

Consideration allocated to:
Total tangible assets, including cash of $8	$	2,161
Intangible assets subject to amortization over 8 years	2,638
Goodwill	2,701
Total assets acquired	7,500
Less: total liabilities	(3,561		)
Total net assets acquired	$	3,939
Consideration:
Cash	$	2,558
Common shares	953
Contingent consideration payable	428
	$	3,939

AEC

Business combinations

Schedule of fair value of the assets acquired and liabilities assumed

Consideration allocated to:
Total tangible assets	$	685
Intangible assets subject to amortization over 8 years	832
Total assets acquired	1,517
Less: total liabilities	(392		)
Total net assets acquired	$	1,125