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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule Of Long-Term Investments Measured At Fair Value Using Significant Unobservable Inputs (Level 3 Inputs) |
(in thousands) |  | 2014 |  | 2013
Balance as of January 1 | $ | 9,921 | $ | 10,324
Net unrealized gains included in other comprehensive income |  | 1,369 |  | 418
Sales of investments at par value |  | (10,282) |  | (821)
Balance as of December 31 | $ | 1,008 | $ | 9,921
Unrealized losses still held as of December 31 | $ | 64 | $ | 1,433
Schedule Of Calculation Of Basic And Diluted Earnings Per Share |
|  |  | Year Ended December 31,
(in thousands, except per share data) |  | 2014 |  | 2013 |  | 2012
Net income | $ | 82,442 | $ | 111,159 | $ | 56,607
Denominator for basic earnings per share – weighted- |  |  |  |  |  |
| average number of common shares outstanding |  |  |  |  |  |
| during the period |  | 53,538 |  | 54,213 |  | 56,320
Incremental common shares attributable to exercise of |  |  |  |  |  |
| dilutive options |  | 450 |  | 324 |  | 150
Incremental common shares attributable to outstanding |  |  |  |  |  |
| restricted shares and restricted stock units |  | 234 |  | 242 |  | 164
Denominator for diluted earnings per share |  | 54,222 |  | 54,779 |  | 56,634
Basic earnings per share | $ | 1.54 | $ | 2.05 | $ | 1.01
Diluted earnings per share | $ | 1.52 | $ | 2.03 | $ | 1.00
Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Stock-Based Awards |
|  |  |  |  |  |  |  | Performance-
|  |  |  |  |  |  |  | based
|  |  |  |  |  | Restricted |  | Restricted
|  | Stock |  | Restricted |  | Stock |  | Stock
(in thousands) |  | Options |  | Shares |  | Units |  | Units(1)
Unrecognized compensation cost | $ | 4,380 | $ | 817 | $ | 5,996 | $ | 1,742
Remaining weighted-average |  |  |  |  |  |  |  |
amortization period |  | 1.6 years |  | 0.8 years |  | 2.5 years |  | 2.2 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 |
|  |  | Year Ended December 31,
(in thousands) |  | 2014 |  | 2013 |  | 2012
| Options granted |  | 378 |  | 348 |  | 432
| Expected term of options |  | 7.0 years |  | 7.4 years |  | 6.3 years
| Expected volatility |  | 39% |  | 42% |  | 42%
| Risk-free interest rate |  | 2.081% |  | 1.396% |  | 1.305%
| Dividend yield |  | zero |  | zero |  | zero

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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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=6415400&loc=d3e5070-113901 + Details
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