Notes Receivable and Other Non-Current Assets (Notes Receivable and Other Non-Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Notes Receivable And Other Long Term Assets [Abstract]
Notes receivable	$ 114,256	$ 118,892	[1]
Long-term prepaid assets	176,094	167,975	[1]
Other miscellaneous assets	162,438	208,748	[1]
Balance as of December 31	$ 452,788	$ 495,615	[1]

[1] December 31, 2011 balances have been revised to reflect purchase accounting measurement period adjustments.