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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Line of Credit [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 328,000	$ 352,500
Fair value of debt	330,870	356,686
Senior Notes [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	217,483	217,349
Fair value of debt	242,494	241,257
Capital Lease Obligations [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	0	12,610
Letter of credit [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 370	$ 570

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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