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Summary of significant accounting policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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