Income Taxes (Components Of Net Deferred Income Tax Asset And Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Noncurrent deferred tax assets:
Net operating losses	$ 50,143	$ 369,924
Property, equipment and intangible basis differences	2,583	28,226
Accrued liabilities	12,264	45,885
Non-cash compensation	19,908	14,913
Deferred revenue	3,904	43,608
Allowance for doubtful accounts	6,187	647
Currency translation	33,088	57,015
Other	1,032	4,357
Valuation allowance	(70,233)	(292,871)
Total noncurrent deferred tax assets, net	58,876	271,704
Noncurrent deferred tax liabilities:
Property, equipment and intangible basis differences	(65,459)	(242,763)
Straight-line Rents	(18,081)	(28,058)
Deferred lease costs	(1,087)	(11,611)
Other	(922)	(14,448)
Total noncurrent deferred tax liabilities, net	(26,673)	(25,176)
Other Assets [Member]
Noncurrent deferred tax assets:
Total noncurrent deferred tax assets, net	774	619
Other Long-Term Liabilities [Member]
Noncurrent deferred tax liabilities:
Total noncurrent deferred tax liabilities, net	$ (27,447)	$ (25,795)