Stockholders' Equity - Common shares (Details) - shares		12 Months Ended
	Jul. 19, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of year		98,828,000
Issuance of common stock	3,000,000
Balance, end of year		101,517,000	98,828,000
Common Stock [Member]
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of year		98,828,098	95,924,339	87,514,336
Issuance of common stock		2,493,171	3,073,445	8,293,369
Non-vested stock-based awards, net of withheld shares and forfeitures		195,740	(169,686)	116,634
Balance, end of year		101,517,009	98,828,098	95,924,339