Geographic Information (Revenue by Geographic Locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Reportable_Segments	Mar. 31, 2012
Segment Reporting [Abstract]
Number of reportable segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 52,566	$ 43,827
Long-lived assets	439,929	354,679
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	36,232	30,490
Long-lived assets	317,727	261,713
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,657	382
Long-lived assets	9,467	0
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,303	2,422
Long-lived assets	12,840	14,452
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	10,518	9,167
Long-lived assets	1,195	1,441
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	724	795
Long-lived assets	69,878	65,749
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	526	571
Long-lived assets	235	260
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	218	0
Long-lived assets	17,364	11,064
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,388	0
Long-lived assets	$ 11,223	$ 0