Variable Interest Entities VIEs (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 404,058	$ 342,065	$ 467,421	$ 378,358
Other current assets	20,908	19,538
Licenses	1,437,831	1,401,126
Property, plant and equipment, net	2,761,404	2,856,520
Other assets and deferred charges	133,704	117,735
Liabilities
Current liabilities	871,210	1,006,173
Variable Interest Entities (VIE's)
Assets
Cash and cash equivalents	2,466	2,076
Other current assets	71	1,184
Licenses	311,476	310,475
Property, plant and equipment, net	15,311	18,600
Other assets and deferred charges	148	511
Total assets	329,472	332,846
Liabilities
Current liabilities	29	46
Deferred liabilities and credits	1,689	3,139
Total liabilities	$ 1,718	$ 3,185