Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013 Reportable_Segments	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments													1
External Revenues	$ 50,847	$ 50,293	$ 51,004	$ 52,566	$ 54,023	$ 53,804	$ 47,716	$ 43,827	$ 44,050	$ 42,602	$ 42,267	$ 40,050	$ 204,710	$ 199,370	$ 168,969
Long-lived assets	451,515				435,277				347,365				451,515	435,277	347,365
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													139,519	140,933	120,780
Long-lived assets	309,732				317,338				259,425				309,732	317,338	259,425
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													7,431	6,395	836
Long-lived assets	8,784				9,738				0				8,784	9,738	0
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													5,508	8,227	10,504
Long-lived assets	10,886				12,726				14,179				10,886	12,726	14,179
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													38,260	36,330	31,991
Long-lived assets	803				1,267				1,286				803	1,267	1,286
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													3,114	2,827	2,943
Long-lived assets	68,987				70,173				63,866				68,987	70,173	63,866
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													2,311	2,205	1,915
Long-lived assets	97				240				233				97	240	233
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													650	233	0
Long-lived assets	23,784				11,784				8,376				23,784	11,784	8,376
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													7,917	2,220	0
Long-lived assets	$ 28,442				$ 12,011				$ 0				$ 28,442	$ 12,011	$ 0