Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2007	Jan. 01, 2007
Income Tax Disclosure [Line Items]
Valuation allowance recorded	$ (1,929,000)	$ 15,028,000
Net deferred tax asset	12,648,000	14,384,000
Net deferred tax asset, current	3,659,000	1,985,000
Net deferred tax asset, noncurrent	8,989,000	12,399,000
Alternative minimum tax carry forwards	3,118,000	2,993,000
Accrued income taxes	24,100,000
Accrued income taxes, current	15,200,000
Accrued income taxes, current judgment	8,000,000
Accrued income taxes, noncurrent judgment	6,500,000
Gross tax benefits	2,171,000	1,974,000	8,058,000	11,412,000	11,400,000	10,800,000
Unrecognized tax interest	3,200,000	2,200,000	12,600,000		2,300,000	1,700,000
Increase (decrease) to unrecognized tax benefits	200,000	(6,100,000)	(3,400,000)
Increase (decrease) to unrecognized tax interest	1,100,000	(10,400,000)	8,800,000
Unrecognized tax benefits and interest	5,300,000	4,100,000	20,600,000
Unrecognized tax benefits that would impact of effective tax rate if recognized	4,300,000	3,000,000
Uncertain tax position probable changes in next 12 months, minimum	500,000
Uncertain tax position probable changes in next 12 months, maximum	1,500,000
United States, Puerto Rico And New Zealand [Member]
Income Tax Disclosure [Line Items]
Valuation allowance recorded	37,900,000
Australia [Member]
Income Tax Disclosure [Line Items]
Line of credit facility, maximum borrowing capacity	100,000,000
Net deferred tax asset, current		3,400,000
Net deferred tax asset, noncurrent		11,000,000
Net operating loss carry forwards	45,900,000
United States [Member]
Income Tax Disclosure [Line Items]
Net operating loss carry forwards	21,700,000
Alternative minimum tax carry forwards	3,100,000
New Zealand [Member]
Income Tax Disclosure [Line Items]
Net operating loss carry forwards	16,300,000
Puerto Rico [Member]
Income Tax Disclosure [Line Items]
Net operating loss carry forwards	14,100,000
Net operating loss carryfowards, expiration dates	2018
Expire Between 2025 And 2030 [Member] | United States [Member]
Income Tax Disclosure [Line Items]
Net operating loss carry forwards	14,400,000
Expire Between 2025 And 2030 [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryfowards, expiration dates	2025
Expire Between 2025 And 2030 [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryfowards, expiration dates	2030
Expire Between 2030 And 2035 [Member] | United States [Member]
Income Tax Disclosure [Line Items]
Net operating loss carry forwards	$ 7,300,000
Expire Between 2030 And 2035 [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryfowards, expiration dates	2030
Expire Between 2030 And 2035 [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryfowards, expiration dates	2035