CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 28,095	$ 8,470	$ 1,226
Amortization of loss on interest rate swap agreements, net of tax (2012: $0; 2011: $451; 2010: $212)	0	677	318
Change in accumulated pension obligation, net of tax (Note15)	200	(30)	33
COMPREHENSIVE INCOME	$ 28,295	$ 9,117	$ 1,577