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Accounts Receivable
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

3. Accounts Receivable

Accounts receivable consisted of the following at December 31:
 
 
(in thousands)
2014
2013
Contract receivables
$
120,295
$
113,572
Contract retainages
38,379
60,694
Other
606
334
159,280
174,600
Less: Allowance for doubtful accounts
(1,179
)
(1,132
)
$
158,101
$
173,468
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
 
 
(in thousands)
2014
2013
2012
Balance at beginning of period
$
1,132
$
1,305
$
1,078
Less: Reduction in (provision for) allowances
(96
)
159
(383
)
Less: Write offs, net of recoveries
49
14
156
Balance at end of period
$
1,179
$
1,132
$
1,305