Taxes (Details 3) - Uncertain Tax Positions (USD $)	12 Months Ended
	Dec. 31, 2013 tax_examinations	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits
Balance, beginning of year	$ 18,664,000	$ 16,729,000
Additions based on tax positions related to the current year	3,919,000	1,946,000
Additions for tax positions of prior years	663,000	0
Reductions for tax positions of prior years	0	(11,000)
Balance, end of year	23,246,000	18,664,000	16,729,000
Uncertain Tax Positions, Additional Disclosures
Unrecognized tax benefits that, if recognized, would favorably impact effective tax rate	8,200,000	3,300,000
Unrecognized tax benefits that, if recognized, would be recorded as an adjustment to other current and non-current assets	15,100,000
Accrued interest or penalties related to income tax matters on the consolidated balance sheets	0	0
Amount for interest or penalties related to unrecognized tax benefits recorded in the consolidated statements of comprehensive income	0	0	0
Number of income tax examinations currently in process	0
U.S. federal and state | Minimum
Uncertain Tax Positions, Additional Disclosures
Tax years for which we remain subject to income tax examinations	2009
U.S. federal and state | Maximum
Uncertain Tax Positions, Additional Disclosures
Tax years for which we remain subject to income tax examinations	2013
Federal
Uncertain Tax Positions, Additional Disclosures
Income tax refunds received	$ 0
International jurisdictions | Minimum
Uncertain Tax Positions, Additional Disclosures
Tax years for which we remain subject to income tax examinations	2007
International jurisdictions | Maximum
Uncertain Tax Positions, Additional Disclosures
Tax years for which we remain subject to income tax examinations	2013