Segment Information - Segment Information by Geographic Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 407,144	$ 389,507	$ 373,528
Puerto Rico
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	329,533	326,073	322,457
Caribbean
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	14,909	16,272	13,551
Latin America
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 62,702	$ 47,162	$ 37,520