LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Long-term debt obligations
Long-term debt	$ 105,080	$ 112,845
Less current portion	30,725	31,513
Long-term debt, less current portion	74,355	81,332
Payments under long-term debt obligations
Due in one year or less	32,414
Due after one year through two years	25,559
Due after two years through three years	19,040
Due after three years through four years	32,341
Due after four years through five years	227
Due after five years	194
Total payments	109,775
Less amounts representing interest	4,695
Long-term debt	105,080	112,845
Term Loan
Long-term debt obligations
Long-term debt	80,625	83,750
Interest rate (as a percent)	1.70%
Payments under long-term debt obligations
Due in one year or less	15,485
Due after one year through two years	18,078
Due after two years through three years	18,826
Due after three years through four years	32,120
Total payments	84,509
Less amounts representing interest	3,884
Long-term debt	80,625	83,750
Notes payable
Long-term debt obligations
Long-term debt	18,036	22,082
Weighted-average interest rate (as a percent)	2.90%
Payments under long-term debt obligations
Due in one year or less	14,132
Due after one year through two years	4,262
Total payments	18,394
Less amounts representing interest	358
Long-term debt	18,036	22,082
Capital lease obligations
Long-term debt obligations
Long-term debt	6,419	7,013
Weighted-average interest rate (as a percent)	4.90%
Payments under long-term debt obligations
Due in one year or less	2,797
Due after one year through two years	3,219
Due after two years through three years	214
Due after three years through four years	221
Due after four years through five years	227
Due after five years	194
Total payments	6,872
Less amounts representing interest	453
Long-term debt	$ 6,419	$ 7,013