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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Change in amounts of the allowance for doubtful accounts
The change in amounts of the allowance for doubtful accounts during the three year period ended December 31, 2013 is as follows (in thousands):
Period ended
 
Balance at beginning of period
 
Charged to expense
 
Deductions or other
 
Balance at end of period
December 31, 2011
 
$
4,125

 
$
2,867

 
$
(1,197
)
 
$
5,795

December 31, 2012
 
5,795

 
2,115

 
(2,019
)
 
5,891

December 31, 2013
 
5,891

 
2,925

 
(3,091
)
 
5,725
Changes in the Company’s warranty liability
Changes in the Company’s warranty liability were as follows (in thousands):
Period ended
 
Balance at beginning of period
 
Charged to expense
 
Deductions or other
 
Balance at end of period
December 31, 2011
 
$
6,708

 
$
1,232

 
$
(3,026
)
 
$
4,914

December 31, 2012
 
4,914

 
2,083

 
(3,220
)
 
3,777

December 31, 2013
 
3,777

 
3,442

 
(1,939
)
 
5,280
Reconciliation of the number of shares used for the basic and diluted earnings per share computations
The following is a reconciliation of the number of shares used for the basic and diluted earnings per share computations (shares in thousands):
 
 
December 31,
 
 
2013
 
2012
 
2011
Basic weighted average shares outstanding
 
90,697

 
80,111

 
63,270

Dilutive effect of stock option and restricted share plan
 
3,907

 
6,826

 
4,218

Diluted weighted average shares outstanding
 
94,604

 
86,937

 
67,488