Variable Interest Entities VIEs (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 398,541	$ 342,065	$ 419,696	$ 378,358
Other current assets	19,702	19,538
Licenses	1,425,945	1,401,126
Property, plant and equipment, net	2,776,220	2,856,520
Other assets and deferred charges	132,536	117,735
Liabilities
Current liabilities	868,071	1,006,173
Variable Interest Entities (VIE's)
Assets
Cash and cash equivalents	2,325	2,076
Other current assets	1,126	1,184
Licenses	310,475	310,475
Property, plant and equipment, net	16,940	18,600
Other assets and deferred charges	511	511
Total assets	331,377	332,846
Liabilities
Current liabilities	135	46
Deferred liabilities and credits	2,122	3,139
Total liabilities	$ 2,257	$ 3,185