Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended						12 Months Ended				12 Months Ended			12 Months Ended				12 Months Ended				12 Months Ended					12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Land	Dec. 31, 2011 Land	Dec. 31, 2012 Building and building improvements	Dec. 31, 2011 Building and building improvements	Dec. 31, 2012 Building and building improvements Minimum	Dec. 31, 2012 Building and building improvements Maximum	Dec. 31, 2012 Leasehold improvements	Dec. 31, 2011 Leasehold improvements	Dec. 31, 2012 Leasehold improvements Maximum	Dec. 31, 2012 Racking	Dec. 31, 2011 Racking	Dec. 31, 2012 Racking Minimum	Dec. 31, 2012 Racking Maximum	Dec. 31, 2012 Warehouse equipment and vehicles	Dec. 31, 2011 Warehouse equipment and vehicles	Dec. 31, 2012 Warehouse equipment and vehicles Minimum	Dec. 31, 2012 Warehouse equipment and vehicles Maximum	Dec. 31, 2012 Furniture and fixtures	Dec. 31, 2011 Furniture and fixtures	Dec. 31, 2012 Furniture and fixtures Minimum	Dec. 31, 2012 Furniture and fixtures Maximum	Dec. 31, 2011 Computer hardware and software	Dec. 31, 2010 Computer hardware and software	Dec. 31, 2012 Computer hardware and software	Dec. 31, 2012 Computer hardware and software Minimum	Dec. 31, 2012 Computer hardware and software Maximum	Dec. 31, 2012 Construction in progress	Dec. 31, 2011 Construction in progress	Dec. 31, 2011 International Business Computer hardware and software	Dec. 31, 2012 North American Business Computer hardware and software	Dec. 31, 2011 North American Business Computer hardware and software
Property, plant and equipment
Useful life							5 years	40 years			10 years			1 year	20 years			2 years	10 years			2 years	10 years				3 years	5 years
Property, plant and equipment, stated at cost	$ 4,443,323	$ 4,232,594	$ 199,354	$ 172,454	$ 1,217,107	$ 1,109,176			$ 461,927	$ 474,965		$ 1,481,377	$ 1,420,180			$ 366,754	$ 355,951			$ 81,093	$ 79,193			$ 527,585		$ 526,973			$ 108,738	$ 93,090
Deferred software cost written off																								3,500	0						3,050	1,110	450
A reconciliation of liabilities for assets retirement obligation
Assets Retirement Obligations, beginning of the year	10,116	9,465
Liabilities Incurred	389	300
Liabilities Settled	(785)	(774)
Accretion Expense	1,056	1,327
Change in Probability Adjustment		(176)
Foreign Currency Exchange Movement	206	(26)
Assets Retirement Obligations, end of the year	$ 10,982	$ 10,116