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Earnings per Share Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The table below presents a reconciliation between basic and diluted weighted average shares outstanding, net income available to common shareholders and basic and diluted income per share for the three and six months ended June 30, 2019 and 2018:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(In thousands, except per share amounts) | 2019 |  | 2018 |  | 2019 |  | 2018
NUMERATOR |  |  |  |  |  |  |
Net income | $ | 30,246 |  |  | $ | 27,911 |  |  | $ | 47,969 |  |  | $ | 45,974 |
Interest on 3.00% convertible senior subordinated notes due 2018 (a) | — |  |  | — |  |  | — |  |  | 409 |
Diluted income available to common shareholders | $ | 30,246 |  |  | $ | 27,911 |  |  | $ | 47,969 |  |  | $ | 46,383 |
DENOMINATOR |  |  |  |  |  |  |
Basic weighted average shares outstanding | 27,599 |  |  | 28,571 |  |  | 27,549 |  |  | 28,349 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock option awards | 308 |  |  | 353 |  |  | 276 |  |  | 409 |
Deferred compensation awards | 183 |  |  | 177 |  |  | 202 |  |  | 194 |
3.00% convertible senior subordinated notes due 2018 (a) | — |  |  | — |  |  | — |  |  | 866 |
Diluted weighted average shares outstanding - adjusted for assumed conversions | 28,090 |  |  | 29,101 |  |  | 28,027 |  |  | 29,818 |
Earnings per common share: |  |  |  |  |  |  |
Basic | $ | 1.10 |  |  | $ | 0.98 |  |  | $ | 1.74 |  |  | $ | 1.62 |
Diluted | $ | 1.08 |  |  | $ | 0.96 |  |  | $ | 1.71 |  |  | $ | 1.56 |
Anti-dilutive equity awards not included in the calculation of diluted earnings per common share | 412 |  |  | 434 |  |  | 714 |  |  | 326 |
(a) On March 1, 2013, the Company issued $86.3 million in aggregate principal amount of 3.0% Convertible Senior Subordinated Notes due 2018 (the “2018 Convertible Senior Subordinated Notes”). The 2018 Convertible Senior Subordinated Notes were scheduled to mature on March 1, 2018 and the deadline for holders to convert the 2018 Convertible Senior Subordinated Notes was February 27, 2018. As a result of conversion elections made by holders of the 2018 Convertible Senior Subordinated Notes, (1) approximately $20.3 million in aggregate principal amount of the 2018 Convertible Senior Subordinated Notes were converted and settled through the issuance of approximately 0.629 million of our common shares (at a conversion price per common share of $32.31) and (2) the Company repaid in cash approximately $65.9 million in aggregate principal amount of the 2018 Convertible Senior Subordinated Notes at maturity.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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