Geographic Information (Revenue by Geographic Locations) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Reportable_Segments	Jun. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 64,712	$ 51,476	$ 128,465	$ 102,880
Long-lived assets	556,592	470,357	556,592	470,357
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			98,052	69,260
Long-lived assets	406,544	314,673	406,544	314,673
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,210	2,743
Long-lived assets	7,270	8,670	7,270	8,670
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			3,000	2,981
Long-lived assets	7,936	11,503	7,936	11,503
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			16,294	19,310
Long-lived assets	497	750	497	750
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,421	2,260
Long-lived assets	68,668	68,402	68,668	68,402
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,209	1,353
Long-lived assets	287	94	287	94
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,719	549
Long-lived assets	39,636	37,449	39,636	37,449
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			3,560	4,424
Long-lived assets	$ 25,754	$ 28,816	$ 25,754	$ 28,816