Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Income before income taxes	$ 234,247,000	$ 94,406,000	$ 38,295,000
Statutory tax rate (in hundredths)	35.00%	35.00%	35.00%
Income tax expense (benefit) expected	81,986,000	33,042,000	13,403,000
Foreign currency translation adjustments	(417,000)	6,409,000	1,099,000
Impact of foreign taxes	3,890,000	(3,094,000)	(1,565,000)
Enhanced tax depreciation incentive	0	(7,971,000)	(3,380,000)
Stock based compensation	4,013,000	2,381,000	1,814,000
Increase in valuation allowance	36,815,000	19,991,000	16,199,000
Branch and other foreign income pick-up in the United States and Canada	(14,363,000)	(3,957,000)	(5,931,000)
Non-deductible third party royalty in Colombia	8,525,000	5,506,000	3,532,000
Non-taxable gain on acquisition	(7,595,000)
Other permanent differences	(5,524,000)	4,927,000	(817,000)
Total income tax expense	107,330,000	57,234,000	24,354,000
Current income tax	136,015,000	76,913,000	38,795,000
Deferred tax recovery	(28,685,000)	(19,679,000)	(14,441,000)
Total income tax expense	107,330,000	57,234,000	24,354,000
Deferred Tax Assets [Abstract]
Tax benefit of loss carryforwards	63,910,000	27,527,000
Tax basis in excess of book basis	17,065,000	7,975,000
Foreign tax credits and other accruals	27,164,000	16,895,000
Capital losses	2,433,000	1,413,000
Deferred tax assets before valuation allowance	110,572,000	53,810,000
Valuation allowance	(102,796,000)	(48,958,000)
Deferred tax assets, net	7,776,000	4,852,000
Deferred tax assets - current	3,029,000	4,852,000
Deferred tax assets - long-term	4,747,000	0
Deferred tax assets, net	7,776,000	4,852,000
Deferred Tax Liabilities [Abstract]
Long-term - book value in excess of tax basis	(186,799,000)	(204,570,000)
Deferred tax liabilities total	(186,799,000)	(204,570,000)
Net Deferred Tax Liabilities	(179,023,000)	(199,718,000)
Operating loss carryforwards	361,600,000	95,600,000
Capital losses before valuation allowance	13,700,000	4,000,000
Operating Loss Carryforwards expiring within one year	1,200,000
Foreign deferred remittance tax percentage of profit - Colombia, Percentage of balance sheet equity (in hundredths)	6.00%
Equity tax	8,300,000
Net operating loss carryforward from foreign subsidiaries	339,800,000	75,400,000
Equity tax for foreign operations - Columbia, assessment term (in years)	4Y
Equity tax for foreign operations - Columbia, number of semi-annual installments	8Y
Interest and penalties included in unrecognized tax benefits in deferred and current income tax liabilities	1,600,000
Equity tax for foreign operations - Columbia, payment term (in years)	4Y
Unrecognized tax benefit roll forward
Unrecognized tax benefit at January 1, 2011	4,175,000
Changes for tax positions relating to prior year	585,000
Additions to tax position related to the current year	15,740,000
Unrecognized tax benefit at December 31, 2011	$ 20,500,000	$ 4,175,000