Cumulative Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	$ (19,587)
Other comprehensive income (loss) before reclassifications	15,878
Amounts reclassified from cumulative other comprehensive income (loss) to net income	93
Net current period other comprehensive income (loss)	15,971
Balance at the end of the period	(3,616)
Unrealized Loss on Investment in Available for Sale Securities
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(19,820)
Other comprehensive income (loss) before reclassifications	16,821
Net current period other comprehensive income (loss)	16,821
Balance at the end of the period	(2,999)
Unrealized Gain on Derivative Instruments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	276
Other comprehensive income (loss) before reclassifications	(996)
Amounts reclassified from cumulative other comprehensive income (loss) to net income	94
Net current period other comprehensive income (loss)	(902)
Balance at the end of the period	(626)
Equity in Unrealized Gain (Loss) of an Investee
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(43)
Other comprehensive income (loss) before reclassifications	53
Amounts reclassified from cumulative other comprehensive income (loss) to net income	(1)
Net current period other comprehensive income (loss)	52
Balance at the end of the period	$ 9