Orange County-Poughkeepsie Limited Partnership (Summarized O-P Income Statement Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Company share	$ 13,000	$ 11,021	$ 7,898
O-P [Member]
Net revenue	331,278	310,416	273,340	[1]
Cellular service cost	156,699	151,712	122,142	[1]
Operating expenses	84,927	81,152	53,832	[1]
Operating income	89,652	77,552	97,366	[1]
Other income	27	14	40	[1]
Net income	89,679	77,566	97,406	[1]
Company share	$ 7,271	$ 6,290	$ 7,898	[1]

[1] The twelve months ended December 31, 2011 income statement represents five months of the O-P operating as a wholesale business and seven months of the O-P operating as a retail business in accordance with Amendment 6 to the O-P Limited Partnership Agreement effective May 1, 2011.