Geographic Information (Revenue by Geographic Locations) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Reportable_Segments	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date	Mar. 31, 2017
Revenue, Net, Increase (Decrease)	$ 8,037
External Revenues	79,103	$ 71,066
Long-lived assets	598,166	558,146	$ 598,166
Increase (Decrease) in Deferred Income Taxes	850	165
Goodwill, Acquired During Period	0			$ 35,787
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	52,179	52,796
Long-lived assets	385,474	372,004	385,474
Long Lived Assets, Increase (Decrease)			13,500
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	1,300
External Revenues	2,108	847
Long-lived assets	6,389	6,968	6,389
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	3,899	1,137
Long-lived assets	24,374	6,708	24,374
Long Lived Assets, Increase (Decrease)			17,700
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	8,899	7,792
Long-lived assets	1,290	171	1,290
Effect of Exchange Rate on Revenue	400
Long Lived Assets, Increase (Decrease)			1,100
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,731	1,434
Long-lived assets	17,457	68,718	17,457
Long Lived Assets, Increase (Decrease)			(51,300)
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	480	391
Long-lived assets	216	221	216
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase In Value Of Long Lived Assets From Continued Product Development			3,300
Revenue, Net, Increase (Decrease)	3,600
External Revenues	5,620	2,026
Long-lived assets	87,301	76,789	87,301
Long Lived Assets, Increase (Decrease)			10,500
Payment Of Deferred Taxes			6,700
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	2,700
External Revenues	4,187	4,643
Long-lived assets	21,696	26,567	21,696
Effect of Exchange Rate on Revenue	(700)
Long Lived Assets, Increase (Decrease)			$ 4,900
Foreign Currency Translation Gain (Loss), Percent			15.00%
Dubai [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	0	0
Long-lived assets	$ 53,969	$ 0	$ 53,969
Long Lived Assets, Increase (Decrease)			$ 54,000