Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Activities    
Net income attributable to Atlas $ 17,702 $ 6,180
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Amortization of fixed assets 856 795
Share-based compensation expense 1,469 247
Amortization of deferred gain on sale of headquarters building (43) (43)
Deferred income taxes (8,776) (1,072)
Net realized gains (382) (433)
(Gain) loss in equity of investee (632) 28
Amortization of bond premiums and discounts 756 1,092
Net changes in operating assets and liabilities:    
Accounts receivable and other assets, net (11,826) (7,490)
Due from reinsurers and other insurers (2,925) (6,872)
Deferred policy acquisition costs (1,492) (1,676)
Other assets and accrued investment income 34 (14)
Claims liabilities 1,045 (4,891)
Unearned premiums 14,718 9,174
Due to reinsurers and other insurers (157) (1,476)
Accounts payable and accrued liabilities 3,369 531
Net cash flows provided by (used in) operating activities 13,716 (5,920)
Investing activities:    
Purchase of Gateway (net of cash acquired) 0 11,081
Fixed income securities (31,671) (69,328)
Equity securities (1,969) 0
Other investments (12,500) 0
Property, equipment and other (1,177) (1,245)
Fixed income securities 35,332 55,328
Equity securities 12 1,388
Property, equipment and other 10 0
Net cash flows used in investing activities (11,963) (2,776)
Financing activities:    
Repurchase of preferred shares 0 (16,200)
Proceeds from initial public offering, net of offering costs 0 9,756
Issuance of common shares 25,021 0
Warrants exercised 0 7,181
Dividends paid 0 (2,145)
Options exercised 1 3
Net cash flows provided by financing activities 25,022 (1,405)
Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]    
Net change in cash and cash equivalents 26,775 (10,101)
Cash and cash equivalents, beginning of period 9,811 19,912
Cash and cash equivalents, end of period 36,586 9,811
Supplemental disclosure of cash information (in '000's):    
Cash paid for interest 3,308 1,430
Cash paid for income taxes $ 0 $ 129