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Earnings Per Share Earnings Per Share (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings Per Share [Abstract] |  |
Unvested performance-based restricted stock units and associated dividend equivalent rights | 303,000 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 363,000 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + 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 55 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2626-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2538-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Issuable Shares -URI http://asc.fasb.org/extlink&oid=6508586 + Details
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