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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Summary Of Significant Accounting Policies [Abstract] |
Schedule Of Long-Term Investments Measured At Fair Value Using Significant Unobservable Inputs (Level 3 Inputs) |
(in thousands) |  | 2013 |  | 2012
Balance as of January 1 | $ | 10,324 | $ | 24,673
Net unrealized gains included in other comprehensive income |  | 418 |  | 1,476
Sales of investments at par value |  | (821) |  | (15,825)
Balance as of December 31 | $ | 9,921 | $ | 10,324
Unrealized losses still held | $ | 1,433 | $ | 1,851
Schedule Of Calculation Of Basic And Diluted Earnings Per Share |
|  |  | Year Ended December 31,
(in thousands, except per share data) |  | 2013 |  | 2012 |  | 2011
Net income | $ | 111,159 | $ | 56,607 | $ | 51,959
Denominator for basic earnings per share – weighted- |  |  |  |  |  |
| average number of common shares outstanding |  |  |  |  |  |
| during the period |  | 54,213 |  | 56,320 |  | 59,284
Incremental common shares attributable to outstanding |  |  |  |  |  |
| dilutive options |  | 324 |  | 150 |  | 270
Incremental common shares attributable to outstanding |  |  |  |  |  |
| restricted shares, restricted stock units and phantom stock |  | 242 |  | 164 |  | 219
Denominator for diluted earnings per share |  | 54,779 |  | 56,634 |  | 59,773
Basic earnings per share | $ | 2.05 | $ | 1.01 | $ | 0.88
Diluted earnings per share | $ | 2.03 | $ | 1.00 | $ | 0.87
Schedule Of Unrecognized Compensation Cost Nonvested Awards |
|  |  |  |  |  | Phantom |  | Performance
|  |  |  |  |  | Stock and |  | Based
|  |  |  |  |  | Restricted |  | Restricted
|  | Stock |  | Restricted |  | Stock |  | Stock
(in thousands) |  | Options |  | Shares |  | Units |  | Units(1)
Unrecognized compensation cost | $ | 3,839 | $ | 2,166 | $ | 4,081 | $ | 1,565
Remaining weighted-average |  |  |  |  |  |  |  |
amortization period |  | 2.2 years |  | 1.8 years |  | 2.8 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,
|  | 2013 |  | 2012 |  | 2011
Stock Options |  |  |  |  |  |
| Expected term of options |  | 7.4 years |  | 6.3 years |  | 6.2 years
| Expected volatility |  | 42% |  | 42% |  | 41%
| Risk-free interest rate |  | 1.396% |  | 1.305% |  | 2.674%
| 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 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: 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=25499696&loc=d3e19207-110258 + 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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