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Summary Of Significant Accounting Policies (Schedule Of Error Corrections And Prior Period Adjustments) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets | $ 31,351 |  |  |  | $ 29,018 |  |  |  |  |  |  |  | $ 31,351 | $ 29,018 |
Income taxes payable | 5,069 |  |  |  | 5,450 |  |  |  |  |  |  |  | 5,069 | 5,450 |
Retained earnings | 704,905 |  |  |  | 644,085 |  |  |  |  |  |  |  | 704,905 | 644,085 |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | (1,141) | (1,673) | $ (315)
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (5,362) | 17,388 | 5,018
Net income | $ 39,421 | $ 20,565 | $ 21,210 | $ 14,205 | $ 23,338 | $ 16,906 | $ 21,558 | $ 19,439 | $ 67,710 | $ 23,648 | $ 8,256 | $ 11,331 | $ 95,401 | $ 81,241 | $ 110,945
Basic earnings per share | $ 0.78 | $ 0.4 | $ 0.41 | $ 0.27 | $ 0.44 | $ 0.32 | $ 0.4 | $ 0.36 | $ 1.26 | $ 0.44 | $ 0.15 | $ 0.21 | $ 1.85 | $ 1.52 | $ 2.05
Diluted earnings per share | $ 0.77 | $ 0.4 | $ 0.4 | $ 0.27 | $ 0.44 | $ 0.31 | $ 0.4 | $ 0.36 | $ 1.25 | $ 0.43 | $ 0.15 | $ 0.21 | $ 1.83 | $ 1.5 | $ 2.03
Net cash provided by operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 146,804 | $ 135,440 | $ 98,863
Effect of exchange rate changes |  |  |  |  |  |  |  |  |  |  |  |  | (1,021) | (1,262) | 938
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  | $ 30,453 |  |  |  |  |  |  |  |  | 30,453 |
Income taxes payable | $ 5,470 |  |  |  | 5,470 |  |  |  |  |  |  |  | 5,470 | 5,470 |
Retained earnings | 645,500 |  |  |  | 645,500 |  |  |  |  |  |  |  | 645,500 | 645,500 |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  | (452) | (101)
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,408 | 5,018
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,442 | $ 111,159
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.54 | $ 2.05
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 | $ 2.03
Net cash provided by operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 136,601 | $ 99,077
Effect of exchange rate changes |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,483) | 724
As Revised [Member} |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  | 29,018 |  |  |  |  |  |  |  |  | 29,018 |
Income taxes payable | 5,450 |  |  |  | 5,450 |  |  |  |  |  |  |  | 5,450 | 5,450 |
Retained earnings | $ 644,085 |  |  |  | $ 644,085 |  |  |  |  |  |  |  | $ 644,085 | 644,085 |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,673) | (315)
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,388 | 5,018
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 81,241 | $ 110,945
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 | $ 2.05
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.5 | $ 2.03
Net cash provided by operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 135,440 | $ 98,863
Effect of exchange rate changes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,262) | $ 938

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