Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unrealized Gains (Losses) on Investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning of period	$ 1,756	$ 254	$ (2,676)	$ (149)
Other comprehensive income before adjustments	3,782	(262)	8,033	73
Amounts reclassified from AOCI	545	18	726	86
Other comprehensive income	4,327	(244)	8,759	159
AOCI, end of period	6,083	10	6,083	10
Unrealized Gains on Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning of period	5,813	883	11,802	0
Other comprehensive income before adjustments	12,883	(4,668)	11,436	(3,785)
Amounts reclassified from AOCI	(2,892)	934	(7,434)	934
Other comprehensive income	9,991	(3,734)	4,002	(2,851)
AOCI, end of period	15,804	(2,851)	15,804	(2,851)
Foreign Currency Translation Adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning of period	(67)	(52)	(2)	(49)
Other comprehensive income before adjustments	257	16	192	13
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive income	257	16	192	13
AOCI, end of period	190	(36)	190	(36)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning of period	7,502	1,085	9,124	(198)
Other comprehensive income before adjustments	16,922	(4,914)	19,661	(3,699)
Amounts reclassified from AOCI	(2,347)	952	(6,708)	1,020
Other comprehensive income	14,575	(3,962)	12,953	(2,679)
AOCI, end of period	$ 22,077	$ (2,877)	$ 22,077	$ (2,877)