Prepaid and Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid operating ground leases	$ 61,046	$ 56,916
Prepaid income tax	56,475	57,665
Prepaid assets	31,660	19,037	[1]
Value added tax and other consumption tax receivables	16,412	22,443
Other miscellaneous current assets	66,517	66,790	[1]
Balance	$ 232,110	$ 222,851

[1] December 31, 2012 balances have been revised to reflect purchase accounting measurement period adjustments.