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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 16, 2017 | May 24, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost |  |  | $ 64,208 |  | $ 64,208 |
Total intrinsic value of options exercised |  |  |  |  | 37,976 |
Aggregate intrinsic value of options exercisable |  |  | $ 176,559 |  | $ 176,559 |
Market value of Company's common stock |  |  | $ 53.78 |  | $ 53.78 |
Weighted average exercise price per share |  |  | $ 21.21 |  | $ 21.21 |
Total options outstanding |  |  | 16,676 |  | 16,676 |
Total options exercisable |  |  | 5,421 |  | 5,421 |
Dividends declared per common share |  | $ 0.28 | $ 0.28 | $ 0.26 | $ 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 |  |  |  |  | 2,357 |
Company purchased, cost |  |  |  |  | $ 120,041 |
Remaining stock repurchase authorization amount |  |  | $ 98,710 |  | $ 98,710 |
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% |

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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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- Definition Aggregate dividends declared 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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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