Long-Lived Assets (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 28, 2013	Jan. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment			$ 675,791,000		$ 675,791,000		$ 639,343,000
Less accumulated depreciation and amortization			(168,964,000)		(168,964,000)		(132,146,000)
Total property, plant and equipment, net			506,827,000		506,827,000		507,197,000
Depreciation expense			19,100,000	16,700,000	37,300,000	32,600,000
Amended selling price of parcel of land and warehouse	13,900,000
Commissions and other costs paid through escrow					800,000
Proceeds from sale, net of commissions and other costs paid					13,118,000
Gain on sale of parcel of land and warehouse			6,546,000		6,546,000
Amount required to spend on training employees on broadband telecommunication deployment and operation			300,000		300,000
Proceeds received from sale of radio towers		$ 3,600,000
Minimum lease term under sale and leaseback		10 years