Orange County-Poughkeepsie Limited Partnership (Summarized O-P Income Statement Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Company's share	$ 50,333		$ 3,250		$ 52,373		$ 6,500
O-P [Member]
Net sales	86,305		81,176		170,746		161,068
Cellular service cost	42,441		36,307		80,051		72,287
Operating expenses	23,037		22,237		44,726		43,635
Operating income	20,827		22,632		45,969		45,146
Other income (expense)	42		4		62		7
Net income	20,869		22,636		46,031		45,153
Company's share	$ 558	[1]	$ 1,835	[1]	$ 2,597	[2]	$ 3,661	[2]
Weighted-average ownership percentage	2.673%				8.108%

[1] Company's share for the three months ended June 30, 2014 was calculated using a weighted average ownership rate of 2.673% due to the fact that the Company exercised the Put option and sold all of its ownership interest on April 30, 2014.

[2] Company's share of income for the six months ended June 30, 2014 is a blend of its ownership rate of 8.108% for first quarter earnings and the weighted average ownership rate of 2.673% for the second quarter earnings due to the fact that the Company sold all of its ownership interest on April 30, 2014.