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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May. 27, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Oct. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost |  | $ 36,645 |  | $ 36,645 |  |
Total intrinsic value of options exercised |  |  |  | 58,294 |  |
Aggregate intrinsic value of options exercisable |  | $ 221,962 |  | $ 221,962 |  |
Market value of Company's common stock |  | $ 48.23 |  | $ 48.23 |  |
Weighted average exercise price per share |  | $ 20.30 |  | $ 20.30 |  |
Total options that were outstanding |  | 17,885 |  | 17,885 |  |
Total options that were exercisable |  | 7,947 |  | 7,947 |  |
Dividends declared per common share | $ 0.24 | $ 0.00 | $ 0.00 | $ 0.24 | $ 0.22 |
Cash dividends declared on the Company's common stock |  |  |  | $ 39,852 | $ 36,942 |
Common Stock Buyback [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares purchased and retired |  |  |  | 4,483 |  |
Company purchased, cost |  |  |  | $ 212,092 |  |
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 |  |  |  |  |  | $ 90,621

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