Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Statutory rate	35.00%	35.00%	35.00%
Operating Loss Carryforwards	$ 17,600,000
Tax Credit Carryforward, Amount	6,700,000
Operating Loss Carryforwards, Expiration Dates	2030
Tax Credit Carryforward, Expiration Date	Sep. 15, 2020
Valuation allowance	16,391,000	14,310,000
Liability for Uncertain Tax Positions, Noncurrent	4,500,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,400,000	6,200,000	3,400,000
Income tax benefit	59,158,000	36,806,000	(19,166,000)
Income Tax Examination, Penalties and Interest Expense	200,000	200,000	700,000
Undistributed Earnings of Foreign Subsidiaries	167,900,000	113,400,000
Income Tax Examination, Penalties and Interest Accrued	1,100,000	900,000
Helix [Member]
Income Taxes [Line Items]
Income tax benefit	96,328,000	63,242,000	9,175,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(2,785,000)
Australian Subsidiary [Member]
Income Taxes [Line Items]
Income tax benefit		$ 31,300,000