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Earnings per Share Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018 and 2017:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands, except per share amounts) |  | 2018 |  | 2017 |  | 2018 |  | 2017
NUMERATOR |  |  |  |  |  |  |  |
Net income |  | $ | 27,911 |  |  | $ | 16,989 |  |  | $ | 45,974 |  |  | $ | 33,872 |
Preferred stock dividends (a) |  | — |  |  | (1,219 | ) |  | — |  |  | (2,438 | )
Net income available to common shareholders |  | 27,911 |  |  | 15,770 |  |  | 45,974 |  |  | 31,434 |
Interest on 3.25% convertible senior subordinated notes due 2017 (b) |  | — |  |  | 391 |  |  | — |  |  | 782 |
Interest on 3.00% convertible senior subordinated notes due 2018 (c) |  | — |  |  | 527 |  |  | 409 |  |  | 1,055 |
Diluted income available to common shareholders |  | $ | 27,911 |  |  | $ | 16,688 |  |  | $ | 46,383 |  |  | $ | 33,271 |
DENOMINATOR |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  | 28,571 |  |  | 24,990 |  |  | 28,349 |  |  | 24,864 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock option awards |  | 353 |  |  | 335 |  |  | 409 |  |  | 330 |
Deferred compensation awards |  | 177 |  |  | 209 |  |  | 194 |  |  | 192 |
3.25% convertible senior subordinated notes due 2017 (b) |  | — |  |  | 2,416 |  |  | — |  |  | 2,416 |
3.00% convertible senior subordinated notes due 2018 (c) |  | — |  |  | 2,669 |  |  | 866 |  |  | 2,669 |
Diluted weighted average shares outstanding - adjusted for assumed conversions |  | 29,101 |  |  | 30,619 |  |  | 29,818 |  |  | 30,471 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.98 |  |  | $ | 0.63 |  |  | $ | 1.62 |  |  | $ | 1.26 |
Diluted |  | $ | 0.96 |  |  | $ | 0.55 |  |  | $ | 1.56 |  |  | $ | 1.09 |
Anti-dilutive equity awards not included in the calculation of diluted earnings per common share |  | 434 |  |  | — |  |  | 326 |  |  | 47 |
(a) | The Company’s Articles of Incorporation authorize the issuance of up to 2,000,000 preferred shares, par value $.01 per share. On March 15, 2007, the Company issued 4,000,000 depositary shares, each representing 1/1000th of a 9.75% Series A Preferred Share of the Company (the “Series A Preferred Shares”), or 4,000 Series A Preferred Shares in the aggregate. On April 10, 2013, the Company redeemed 2,000 of its Series A Preferred Shares (and the 2,000,000 related depositary shares) for an aggregate redemption price of approximately $50.4 million in cash. On October 16, 2017, the Company redeemed the remaining 2,000 outstanding Series A Preferred Shares (and the 2,000,000 related depositary shares) for an aggregate redemption price of approximately $50.4 million in cash. The Company declared and paid a quarterly cash dividend of $609.375 per share on its then outstanding Series A Preferred Shares in both the first and second quarter of 2017, for an aggregate dividend payment on the Series A Preferred Shares of $1.2 million and $2.4 million in the three and six months ended June 30, 2017, respectively.
(b) | On September 11, 2012, the Company issued $57.5 million in aggregate principal amount of 3.25% Convertible Senior Subordinated Notes due 2017 (the “2017 Convertible Senior Subordinated Notes”). The 2017 Convertible Senior Subordinated Notes were scheduled to mature on September 15, 2017 and the deadline for holders to convert the 2017 Convertible Senior Subordinated Notes was September 13, 2017. As a result of conversion elections made by holders of the 2017 Convertible Senior Subordinated Notes, all $57.5 million in aggregate principal amount of the 2017 Convertible Senior Subordinated Notes were converted and settled through the issuance of our common shares. In total, we issued approximately 2.4 million common shares (at a conversion price per common share of $23.80).
(c) | On March 1, 2013, the Company issued $86.3 million in aggregate principal amount of 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 Senor 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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