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Equity Investments - RCN (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2007 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings (loss) from equity investments |  | $ 16,900,000 | $ (7,600,000) | $ 1,500,000
Distributed earnings from equity investments |  | 24,900,000 | 28,500,000 | 29,500,000
Roberts Communications Network, LLC (RCN) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage interest in NASRIN, which was sold in exchange for interest in equity investment | 70.00% |  |  |
Equity interest (as a percent) | 29.40% |  |  |
Cash dividends |  | 3,700,000 | 4,300,000 | 3,200,000
Distribution of capital |  | $ 0 | $ 0 | $ 0

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