We calculate and maintain reserves for policyholder claims and benefits for our Life & Group Non-Core segment based on actuarial assumptions. The determination of these reserves is fundamental to our financial results and requires management to make assumptions about expected investment and policyholder experience over the life of the contract. Since many of these contracts may be in force for several decades, these assumptions are subject to significant estimation risk.
Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.4 billion as of December 31, 2011 and 2010. A significant portion of these amounts are supported by collateral. The Company also has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables on the Consolidated Balance Sheets.
The components of other-than-temporary impairment (OTTI) losses recognized in earnings by asset type are summarized in the following table.
The following table summarizes available-for-sale fixed maturity securities by contractual maturity at December 31, 2011 and 2010. Actual maturities may differ from contractual maturities because certain securities may be called or prepaid with or without call or prepayment penalties. Securities not due at a single date are allocated based on weighted average life.
The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2011 and 2010.
At December 31, 2011, the CNA Tax Group had loss carryforwards of approximately $19 million which expire in 2014, and tax credit carryforwards of $18 million of which $14 million expire in 2020.
Overall, favorable development was recorded for general liability coverages. Favorable development in construction defect exposures was due to decreased frequency and severity trends in accident years 2003 and prior. Favorable development in non-construction defect exposures was primarily due to claims closing favorable to expectations in accident years 2006 and prior. Favorable development in our Canadian casualty programs was primarily driven by severity emerging favorable to prior expectations. This development amount also included unfavorable development recorded due to higher than anticipated litigation costs related to mass tort exposures, primarily in accident years 1997 and prior.
The Company occupies office facilities under lease agreements that expire at various dates. In addition, data processing, office and transportation equipment is leased under agreements that expire at various dates. Most leases contain renewal options that provide for rent increases based on prevailing market conditions. Lease expense for the years ended December 31, 2011, 2010 and 2009 was $50 million, $52 million and $51 million. Sublease revenues for the years ended December 31, 2011, 2010 and 2009 were $2 million, $3 million and $4 million.
In 2008, the Company issued, and Loews purchased, $1.25 billion of CNAF non-voting cumulative senior preferred stock, which was approved by a special review committee of independent members of CNAF's Board of Directors. As of December 31, 2010, the preferred stock was redeemed in full.
The Company's core property and casualty commercial insurance operations are reported in two business segments: CNA Specialty and CNA Commercial. CNA Specialty provides a broad array of professional, financial and specialty property and casualty products and services, primarily through insurance brokers and managing general underwriters. CNA Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system. CNA Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers.
The Company reimburses Loews, or pays directly, for management fees, travel and related expenses, software fees, and expenses of investment facilities and services provided to the Company. The amounts reimbursed or paid by the Company were $38 million, $38 million and $33 million for the years ended December 31, 2011, 2010 and 2009. The CNA Tax Group is included in the consolidated federal income tax return of Loews and its eligible subsidiaries. See Note E for a detailed description of the income tax agreement with Loews. In addition, the Company writes, at standard rates, a limited amount of insurance for Loews and its subsidiaries. The earned premiums for the years ended December 31, 2011, 2010 and 2009 were $2 million, $2 million and $2 million.