Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000816159 (http://www.sec.gov/CIK)

Leases [Abstract]	Period [Axis]
	2011-01-01 - 2011-12-31	2010-01-01 - 2010-12-31	2009-01-01 - 2009-12-31
Leases [Abstract]
Future minimum lease payments under capital leases [Abstract]
2012	60,984,000
2013	59,066,000
2014	54,262,000
2015	48,208,000
2016	43,160,000
Thereafter	64,651,000
Total minimum lease payments	330,331,000
Less amounts representing interest	(41,023,000)
Present value of minimum capital lease payments	289,308,000
Less current installments	(49,100,000)	(42,327,000)
Noncurrent obligations under capital leases	240,208,000	232,464,000
Future minimum lease payments under operating leases [Abstract]
2012	9,645,000
2013	7,511,000
2014	5,797,000
2015	2,770,000
2016	1,776,000
Thereafter	18,769,000
Total minimum lease payments	46,268,000
Rent expense relating to operating leases [Abstract]
Rent expense relating to operating leases	9,177,000	5,919,000	5,622,000
Unamortized completion allowances	21,798,000	19,990,000
Property held under capital leases [Abstract]
Property held under capital leases, net of accumulated depreciation	258,472,000	249,441,000