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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders’ Equity Preferred Stock The Company is authorized to issue up to 5.0 million shares of Preferred Stock. Any such Preferred Stock issued by the Company may rank prior to common stock as to dividend rights, liquidation preference or both, may have full or limited voting rights and may be convertible into shares of common stock. Common Stock The Company is authorized to issue up to 150.0 million shares of Voting Common Stock and 3.0 million shares of Class B Non-Voting Common Stock. As more fully described in Note 8, the Company is party to a forward equity sale agreement under which the Company may sell shares of its common stock. The Company’s Board of Directors has periodically authorized share repurchase programs, most recently in May 2015, authorizing the Company to repurchase up to 3.0 million shares of its common stock. As of December 31, 2015, there were 2.3 million remaining shares available for repurchase under the May 2015 program, which does not expire. The timing and amount of issuances and repurchases will be determined at the discretion of the Company’s management. The following is a summary of the Company’s recent share repurchase activity:
Period |  | Shares Repurchased |  | Average Price
2013 |  | 0.1 |  |  | $ | 184.89 |
2014 |  | 1.2 |  |  | 204.72 |
2015 |  | 1.7 |  |  | 209.39 |
Financial Instruments The Company’s junior convertible securities contain an embedded right for holders to receive shares of the Company’s common stock under certain conditions. These arrangements, as well as the forward equity sale agreement, meet the definition of equity and are not required to be accounted for separately as derivative instruments.

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- Definition Disclosures related to accounts comprising shareholder's equity, excluding other comprehensive income, specific to preferred stock, common stock, financial instruments, and stock options and incentive plans. + References No definition available. + Details
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