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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ 127,501 | $ 458 | $ (782) | $ 77,449 | $ (445) | $ 50,821
Beginning Balance, Shares at Dec. 31, 2010 |  | 45,811 | 50 |  |  |
Comprehensive income | 50,631 |  |  |  | 85 | 50,546
Common stock purchased for treasury | (23,112) |  | (23,112) |  |  |
Common stock purchased for treasury, Shares |  |  | 1,607 |  |  |
Share-based compensation | 6,452 |  |  | 6,452 |  |
Share-based compensation, Shares |  | 4 |  |  |  |
Exercise of stock options | 1,681 | 2 |  | 1,679 |  |
Exercise of stock options, Shares |  | 140 |  |  |  |
Excess tax benefits | 140 |  |  | 140 |  |
Ending Balance at Dec. 31, 2011 | 163,293 | 460 | (23,894) | 85,720 | (360) | 101,367
Ending Balance, Shares at Dec. 31, 2011 |  | 45,955 | 1,657 |  |  |
Comprehensive income | 69,584 |  |  |  | 137 | 69,447
Common stock purchased for treasury | (15,242) |  | (15,242) |  |  |
Common stock purchased for treasury, Shares |  |  | 753 |  |  |
Share-based compensation | 7,811 | 6 |  | 7,805 |  |
Share-based compensation, Shares |  | 570 |  |  |  |
Restricted shares forfeited |  |  | 10 |  |  |
Exercise of stock options | 8,049 | 5 |  | 8,044 |  |
Exercise of stock options, Shares |  | 611 |  |  |  |
Excess tax benefits | 564 |  |  | 564 |  |
Ending Balance at Dec. 31, 2012 | 234,059 | 471 | (39,136) | 102,133 | (223) | 170,814
Ending Balance, Shares at Dec. 31, 2012 |  | 47,136 | 2,420 |  |  |
Comprehensive income | 89,292 |  |  |  | 581 | 88,711
Common stock purchased for treasury | (8,323) |  | (8,323) |  |  |
Common stock purchased for treasury, Shares |  |  | 340 |  |  |
Share-based compensation | 8,950 | 6 | (973) | 9,917 |  |
Share-based compensation, Shares |  | 594 | 40 |  |  |
Restricted shares forfeited |  |  | 45 |  |  |
Exercise of stock options | 16,278 | 12 |  | 16,266 |  |
Exercise of stock options, Shares |  | 1,160 |  |  |  |
Excess tax benefits | 4,588 |  |  | 4,588 |  |
Ending Balance at Dec. 31, 2013 | $ 344,844 | $ 489 | $ (48,432) | $ 132,904 | $ 358 | $ 259,525
Ending Balance, Shares at Dec. 31, 2013 |  | 48,890 | 2,845 |  |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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