Stockholders' Equity (Authorized and Outstanding Shares) (Details) - USD ($)		12 Months Ended
	Sep. 05, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 28, 2016	Aug. 07, 2014	Jun. 06, 2014	Mar. 24, 2014
Equity, Class of Treasury Stock [Line Items]
Authorized capital stock (in shares)		185,000,000
Common stock - shares authorized (in shares)		180,000,000	180,000,000
Preferred stock - shares authorized (in shares)		5,000,000
Common stock - issued (in shares)		12,240,735	12,208,016
Stock repurchased during the period, value		$ 398,000		$ 60,579,000
Purchases of treasury stock		398,000	$ 0	60,579,000
Treasury stock repurchased (in dollars per share)	$ 26
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period, value	$ 54,700,000	$ 398,000		$ 60,579,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount (in shares)						$ 60,000,000
Stock repurchased during the period (in shares)	2,099,843
2014 Share Repurchase Program | Common Stock
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount (in shares)							$ 3,000,000	$ 10,000,000
Stock repurchased during the period (in shares)				242,383
Stock repurchased during the period, value				$ 5,800,000
2016 Stock Repurchase Program | Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period (in shares)		15,019
Number of shares authorized to be repurchased (in shares)					500,000