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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Calculation of Basic and Diluted Earnings per Share | The following table sets forth the calculation of basic and diluted earnings (loss) per share.
|  |  | Year Ended December 31,
(in thousands, except per share data) |  | 2017 |  |  | 2016 |  |  | 2015
Net income (loss) | $ | (31,965) |  | $ | 64,047 |  | $ | 95,401
Denominator for basic earnings per share – weighted-average number of |  |  |  |  |  |  |  |
| common shares outstanding during the period |  | 49,680 |  |  | 49,298 |  |  | 51,573
Incremental common shares attributable to exercise of dilutive options |  | — |  |  | 313 |  |  | 318
Incremental common shares attributable to outstanding |  |  |  |  |  |  |  |
| restricted stock units |  | — |  |  | 214 |  |  | 197
Denominator for diluted earnings per share |  | 49,680 |  |  | 49,825 |  |  | 52,088
Basic earnings (loss) per share |  | $ (0.64) |  |  | $ 1.30 |  |  | $ 1.85
Diluted earnings (loss) per share |  | $ (0.64) |  |  | $ 1.29 |  |  | $ 1.83
Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Stock-Based Awards | As of December 31, 2017, the unrecognized compensation cost and remaining weighted-average amortization related to stock-based awards were as follows:
|  |  |  |  |  |  | Performance-
|  |  |  |  |  |  | based
|  |  |  |  | Restricted |  | Restricted
|  |  | Stock |  | Stock |  | Stock
(in thousands) |  | Options |  | Units |  | Units(1)
| Unrecognized compensation cost |  | $ 535 |  | $ 10,738 |  | $ 3,345
| Remaining weighted-average amortization period |  | 0.6 years |  | 2.2 years |  | 1.8 years
(1) Based on the probable achievement of the performance goals identified in each award.
Summary Of Weighted-Average Assumptions Used To Value Option Grants | The weighted-average assumptions used to value the options granted during the year ended December 31, 2015 were as follows:
(in thousands) |  |  |
| Options granted |  |  | 289
| Expected term of options |  |  | 6.4 years
| Expected volatility |  |  | 35%
| Risk-free interest rate |  |  | 1.886%
| Dividend yield |  |  | zero

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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://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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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