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Earnings per Share | 9 Months Ended
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Sep. 30, 2016
Earnings per Share [Abstract] |
Earnings per Share | (3) Earnings P er Share (EPS) ﻿ Basic EPS is calculated by dividing net income for a given period by the weighted-average number of common shares outstanding during that period, to which dilutive securities are included in the calculation of diluted EPS, using the treasury stock method. The calculations of the basic and diluted EPS for the three and nine months ended September 30, 2016 and 2015 are presented below:
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﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Three Months Ended September 30, |  | Nine Months Ended September 30,
﻿(in thousands, except per share amounts) | 2016 |  | 2015 |  | 2016 |  | 2015
﻿Net income | $ | 28,801 |  | $ | 19,677 |  | $ | 65,561 |  | $ | 36,580
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Weighted-average common shares outstanding - basic |  | 49,185 |  |  | 49,070 |  |  | 49,132 |  |  | 48,951
﻿Effect of diluted stock options and unvested restricted stock |  | 915 |  |  | 705 |  |  | 517 |  |  | 767
﻿Weighted-average common shares outstanding - diluted |  | 50,100 |  |  | 49,775 |  |  | 49,649 |  |  | 49,718
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Net income per share: |  |  |  |  |  |  |  |  |  |  |
﻿Basic | $ | 0.59 |  | $ | 0.40 |  | $ | 1.33 |  | $ | 0.75
﻿Diluted | $ | 0.57 |  | $ | 0.40 |  | $ | 1.32 |  | $ | 0.74
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Anti-dilutive shares not included above |  | 610 |  |  | 1,580 |  |  | 1,339 |  |  | 909
﻿ With regard to diluted EPS and the impact of the Convertible Notes (as discussed in Note 5) on the diluted EPS calculation, because the Company has the intent and ability to settle the principal amount of the Convertible Notes in cash, per ASC 260, Earnings Per Share, the settlement of the principal amount has no impact on diluted EPS. ASC 260 also requires any potential conversion premium associated with the Convertible Notes’ conversion option to be considered in the calculatio n of diluted EPS when the Company's average stock price for the periods presented is higher than the initial conversion price of $30.25. As this was not the case during the three and nine months ended September 30, 2016, the conversion premium also has no impact on diluted EPS for those periods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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