INCOME TAXES (DTA AND DTL TABLE) (DETAILS) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets, gross
Accrued workers compensation, deferred compensation and employee benefits	$ 17,030	$ 7,866
Allowance for doubtful accounts, insurance and other accruals	4,554	4,037
Amortization of deferred rent liabilities	2,201	1,903
Net operating losses	11,296	11,023
Equity compensation	2,997	6,566
Customer acquisition and deferred revenue accruals	16,241	15,228
Federal and state tax credits, net	10,621	15,886
Unrealized losses on derivatives	11,686	4,446
Other	12,749	9,467
Total deferred tax assets, gross	89,375	76,422
Valuation allowances	(10,721)	(10,792)	(20,909)	(16,555)
Total deferred tax assets, net	78,654	65,630
Deferred tax liabilities
Long-term lease obligations	0	(12)
Depreciation and amortization	(7,035)	1,067
Contract acquisition costs	(11,768)	(11,653)
Future losses in UK	(2,530)	(2,606)
Intangible Assets	(7,628)	0
Other	(355)	(600)
Total deferred tax liabilities	(29,316)	(13,804)
Net deferred tax assets	$ 49,338	$ 51,826