Investment in Affiliates	3 Months Ended
Investment in Affiliates	Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investment in Affiliates	Investment in Affiliates. At March 31, 2015, investments in affiliates consisted principally of equity investments in limited liability companies. The Company has the ability to exercise significant influence over the operating and financial policies of these investments and, accordingly, accounts for its investments using the equity method of accounting. The Company’s operating results include its share of net earnings from its equity method investments. For the three months ended March 31, 2015, the financial results reported by a significant joint venture were $242.3 million for operating revenue and $32.2 million for operating income, income from continuing operations, and net income.

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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