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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 16, 2017 | May 24, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Oct. 24, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost |  |  | $ 57,525 |  | $ 57,525 |  |
Total intrinsic value of options exercised |  |  |  |  | 59,991 |  |
Aggregate intrinsic value of options exercisable |  |  | $ 192,056 |  | $ 192,056 |  |
Market value of Company's common stock |  |  | $ 61.06 |  | $ 61.06 |  |
Weighted average exercise price per share |  |  | $ 21.34 |  | $ 21.34 |  |
Total options outstanding |  |  | 16,158 |  | 16,158 |  |
Total options exercisable |  |  | 4,835 |  | 4,835 |  |
Dividends declared per common share |  | $ 0.28 | $ 0 | $ 0 | $ 0.28 | $ 0.26 |
Cash dividends paid per common share | $ 0.28 |  |  |  |  |  |
Cash dividends declared on the Company's common stock |  |  |  |  | $ 44,264 | $ 42,001 |
Common Stock Buyback [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares purchased and retired |  |  |  |  | 3,538 |  |
Company purchased, cost |  |  |  |  | $ 188,276 |  |
Remaining stock repurchase authorization amount |  |  | $ 30,476 |  | $ 30,476 |  |
2014 Plan [Member] | Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  |  |  | 50.00% |  |
2014 Plan [Member] | Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  |  |  | 50.00% |  |
Subsequent Event [Member] | Common Stock Buyback [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining stock repurchase authorization amount |  |  |  |  |  |  | $ 230,476
Increase in authorization for stock repurchase program |  |  |  |  |  |  | $ 200,000

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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