Schedule I - Condensed Financial Information of the Registrant (Details) - Condensed Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net cash provided by operating activities	$ 68,522	$ 7,800	$ 73,566
Cash flows from investing activities:
Net cash provided by investing activities	(685,822)	(9,539)	(30,917)
Net increase in cash and cash equivalents	(27,698)	47,374	(31,315)
Cash and cash equivalents at end of year	43,920	71,618	24,244
Parent Company [Member]
Cash flows from operating activities:
Net cash provided by operating activities	250
Cash flows from investing activities:
Cash and cash equivalent acquired in merger transaction	2,138
Net cash provided by investing activities	2,138
Net increase in cash and cash equivalents	2,388
Cash and cash equivalents at end of year	$ 2,388