CONSOLIDATED STATEMENT OF CASH FLOWS INFORMATION (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Cash Flow Information [Line Items]
Capital expenditures incurred not yet paid	$ 2,400,000	$ 3,500,000	$ 3,500,000
Fees and expenses related to the amendment	1,258,000	23,000	1,469,000
Revolving Credit Facility
Consolidated Cash Flow Information [Line Items]
Maximum borrowing capacity	350,000,000		250,000,000
Line Of Credit Term A Loan
Consolidated Cash Flow Information [Line Items]
Maximum borrowing capacity	50,000,000		50,000,000
Credit Facility Accordion Feature
Consolidated Cash Flow Information [Line Items]
Maximum borrowing capacity	$ 75,000,000		$ 75,000,000