Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning Balance at Jan. 03, 2010	$ 571,163	$ 2,994	$ 355,429	$ 220,239	$ 0	$ (7,499)	$ 0
Shares, Beginning Balance at Jan. 03, 2010		29,946,393
Comprehensive (loss) income:
Net income (loss)	52,681	0	0	52,155	0	0	526
Unrealized loss on interest rate swap, net of tax	478	0	0	0	478	0	0
Total comprehensive income (loss)	53,159	0	0	52,155	478	0	526
Income tax benefits associated with the exercise of non-qualified stock options	1,289	0	1,289	0	0	0	0
Equity-based compensation expense	6,279	0	6,279	0	0	0	0
Other non-cash compensation expense	577	0	577	0	0	0	0
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors, shares		852,698
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors	8,618	86	8,532	0	0	0	0
Acquisition of noncontrolling interest	2,410	0	0	0	0	0	2,410
Distribution to partnership interests	(278)	0	0	0	0	0	(278)
Treasury shares:
Stock repurchase	(4,985)	0	0	0	0	(4,985)	0
Ending Balance at Dec. 31, 2010	638,232	3,080	372,106	272,394	478	(12,484)	2,658
Shares, Ending Balance at Dec. 31, 2010		30,799,091
Comprehensive (loss) income:
Net income (loss)	(449,884)	0	0	(450,525)	0	0	641
Unrealized loss on interest rate swap, net of tax	(768)	0	0	0	(768)	0	0
Realized loss on interest rate swap	290	0	0	0	290	0	0
Total comprehensive income (loss)	(450,362)	0	0	(450,525)	(478)	0	641
Income tax benefits associated with the exercise of non-qualified stock options	257	0	257	0	0	0	0
Equity-based compensation expense	7,548	0	7,548	0	0	0	0
Other non-cash compensation expense	407	0	407	0	0	0	0
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors, shares		636,173
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors	7,901	64	7,837	0	0	0	0
Acquisition of noncontrolling interest	(320)	0	(352)	0	0	0	32
Distribution to partnership interests	(738)	0	0	0	0	0	(738)
Treasury shares:
Common stock received from Healthfield escrow	(394)	0	0	0	0	(394)	0
Ending Balance at Dec. 31, 2011	202,531	3,144	387,803	(178,131)	0	(12,878)	2,593
Shares, Ending Balance at Dec. 31, 2011		31,435,264
Comprehensive (loss) income:
Net income (loss)	27,680	0	0	26,796	0	0	884
Total comprehensive income (loss)	27,680	0	0	26,796	0	0	884
Income tax benefits associated with the exercise of non-qualified stock options	(223)	0	(223)	0	0	0	0
Equity-based compensation expense	7,645	0	7,645	0	0	0	0
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors, shares		574,022
Net issuance of stock upon exercise of stock options and under stock plans for employees and directors	3,980	57	3,923	0	0	0	0
Acquisition of noncontrolling interest	(1,113)	0	0	0	0	0	(1,113)
Distribution to partnership interests	(826)	0	0	0	0	0	(826)
Treasury shares:
Stock repurchase	(4,974)	0	0	0	0	(4,974)	0
Ending Balance at Dec. 31, 2012	$ 234,700	$ 3,201	$ 399,148	$ (151,335)	$ 0	$ (17,852)	$ 1,538
Shares, Ending Balance at Dec. 31, 2012		32,009,286