Income Taxes Reconciliation of Statutory Federal Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income taxes statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	2.40%	4.20%	(1.50%)
State rate change	(1.10%)	0.00%	3.40%
Penalties	0.00%	(0.30%)	0.00%
Return to provision adjustment	0.00%	(0.30%)	(0.40%)
Other	0.00%	(0.10%)	(0.30%)
Effective income tax rate	36.30%	38.50%	36.20%