Other Non-Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2012

Other Liabilities, Noncurrent [Abstract]

Other non-current liabilities

	2012		2011 (1)
Deferred rent liability	$	254,494	$	226,383
Unearned revenue		164,032		125,472
Other miscellaneous liabilities		225,175		220,229
Balance as of December 31,	$	643,701	$	572,084
(1) December 31, 2011 balances have been revised to reflect purchase accounting measurement period adjustments.