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Earnings Per Share (Narrative) (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Stock options to purchase shares (in shares) | 1,406,371 | 2,626,487 | 3,316,782 | 4,926,522
Diluted shares outstanding (in shares) | 3,258,136 | 3,638,981 | 3,727,839 |
Common stock |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Stock options to purchase shares (in shares) | 1,406,371 | 2,626,487 | 3,316,782 |
Restricted stock and PSU's |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Stock options to purchase shares (in shares) | 4,254,012 | 5,207,423 | 5,405,837 |
Diluted shares outstanding (in shares) | 3,663,919 | 4,842,383 | 4,836,518 |
Stock options |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Diluted shares outstanding (in shares) |  |  | 3,198,842 |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1500-109256 + Details
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