Annual report pursuant to Section 13 and 15(d)

Income Taxes - Deferred income tax assets and liabilities (Details)

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Income Taxes - Deferred income tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets, Net [Abstract]    
Compensation accruals $ 3,330 $ 2,774
Reserves 3,651 3,638
Other accruals 2,252 2,893
Net operating losses 8,220 7,498
Interest rate swaps 1,804 1,715
Energy efficiency 18,110 19,116
Deferred revenue 1,479 1,769
Gross deferred income tax assets 38,846 39,403
Valuation allowance (7,122) (3,995)
Total deferred income tax assets 31,724 35,408
Deferred tax liabilities:    
Depreciation (32,542) (31,326)
Contract refinancing (304) (437)
Acquisition accounting (116) (159)
Total deferred income tax liabilities (35,734) (37,977)
Deferred income tax liabilities, net (4,010) (2,569)
CANADA    
Deferred tax liabilities:    
Foreign Authority (2,234) (5,659)
UNITED KINGDOM    
Deferred tax liabilities:    
Foreign Authority $ (538) $ (396)