Accounts Receivable Insurance and Third Party Claims (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total accounts receivable	$ 363,104,000	$ 340,026,000
Proceeds from insurance	13,600,000	11,100,000	21,800,000
Gain on insurance recoveries			(5,800,000)
Accounts receivable - insurance and other third party claims [Member]
Total accounts receivable	26,941,000	31,643,000
Australia [Member] | Accounts receivable - insurance and other third party claims [Member]
Total accounts receivable	11,300,000
North American & European Operations [Member] | Accounts receivable - insurance and other third party claims [Member]
Total accounts receivable	$ 15,700,000