Accounts Receivable Accounts Receivable, Net (Details) $ in Thousands, AUD in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2016 USD ($)	Jun. 30, 2016 AUD	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			$ 385,494	$ 388,671
Allowance for doubtful accounts			(16,790)	(6,213)
Accounts receivable, net			368,704	382,458
Accounts receivable - trade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			353,503	339,100
Accounts receivable - grants from outside parties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			12,475	22,997	$ 20,900
Accounts receivable - insurance and other third-party claims [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			19,516	$ 26,574
Australian Operations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts - AUS	$ 8,100	AUD 10.9	8,100
Australian Operations [Member] | Accounts receivable - insurance and other third-party claims [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			$ 6,000