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Stock Buy Back Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Number of Shares Purchased and Maximum Value of Shares That yet be Purchased Under Plan | The following table displays the number of shares purchased during 2016 and the maximum value of shares that may yet be purchased under the plan:
|  |  |  |  |  |  |  |  |  |  |  |  | Maximum Value of |
| Total |  |  |  |  |  |  | Total Number of |  |  | Shares that May Yet |
| Number of |  |  | Average |  |  | Shares Purchased as |  |  | Be Purchased Under |
| Shares |  |  | Price Paid |  |  | Part of Publicly |  |  | the Plan |
| Purchased |  |  | Per Share |  |  | Announced Plan |  |  | (in 000’s) |
January 1 to January 31 |  | - |  |  | $ | - |  |  |  | - |  |  | $ | 100,000 |
February 1 to February 28 |  | 943,983 |  |  | $ | 33.97 |  |  |  | 943,983 |  |  | $ | 67,932 |
March 1 to March 31 |  | 269,099 |  |  | $ | 38.27 |  |  |  | 269,099 |  |  | $ | 57,632 |
April 1 to April 30 |  | 454,729 |  |  | $ | 38.78 |  |  |  | 454,729 |  |  | $ | 40,000 |
May 1 to May 31 |  | 307,798 |  |  | $ | 38.34 |  |  |  | 307,798 |  |  | $ | 28,199 |
June 1 to June 30 |  | 330,265 |  |  | $ | 39.96 |  |  |  | 330,265 |  |  | $ | 15,000 |
July 1 to July 31 |  | 66,422 |  |  | $ | 41.03 |  |  |  | 66,422 |  |  | $ | 12,275 |
August 1 to August 31 |  | 299,931 |  |  | $ | 40.92 |  |  |  | 299,931 |  |  | $ | - |
September 1 to September 30 |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
October 1 to October 31 |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
November 1 to November 30 |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
December 1 to December 31 |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Total |  | 2,672,227 |  |  | $ | 37.42 |  |  |  | 2,672,227 |  |  | $ | - |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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