Pensions and Other Employee Benefits Plans (Fair Values of Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 28,476		$ 24,628
Pension plans' actual assets allocation	100.00%		100.00%
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	25,688		21,844
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2,788		2,784		2,488
Level 3 [Member] | Equity Long/Short Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	801		842		682
Level 3 [Member] | Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	249		287		283
Level 3 [Member] | Distressed Opportunity Ltd. Partnership [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	368		364		299
Level 3 [Member] | Other Limited Partnership [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets					33
Level 3 [Member] | Multi Strategy Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1,370		1,291		1,191
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	16,465		14,323
Pension plans' actual assets allocation	58.00%		58.00%
Equity Securities [Member] | U.S. Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	7,031	[1]	5,965	[1]
Pension plans' actual assets allocation	25.00%	[1]	24.00%	[1]
Equity Securities [Member] | U.S. Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2,004	[2]	1,688	[2]
Pension plans' actual assets allocation	7.00%	[2]	7.00%	[2]
Equity Securities [Member] | Global [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2,288	[3]	1,956	[3]
Pension plans' actual assets allocation	8.00%	[3]	8.00%	[3]
Equity Securities [Member] | Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3,494	[4]	3,103	[4]
Pension plans' actual assets allocation	12.00%	[4]	13.00%	[4]
Equity Securities [Member] | Equity Long/Short Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	801	[5]	842	[5]
Pension plans' actual assets allocation	3.00%	[5]	3.00%	[5]
Equity Securities [Member] | Real Estate Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	598	[6]	482
Pension plans' actual assets allocation	2.00%	[6]	2.00%
Equity Securities [Member] | Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	249	[7]	287	[7]
Pension plans' actual assets allocation	1.00%	[7]	1.00%	[7]
Equity Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	15,415		13,194
Equity Securities [Member] | Level 2 [Member] | U.S. Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	7,031	[1]	5,965	[1]
Equity Securities [Member] | Level 2 [Member] | U.S. Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2,004	[2]	1,688	[2]
Equity Securities [Member] | Level 2 [Member] | Global [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2,288	[3]	1,956	[3]
Equity Securities [Member] | Level 2 [Member] | Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3,494	[4]	3,103	[4]
Equity Securities [Member] | Level 2 [Member] | Real Estate Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	598	[6]	482
Equity Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1,050		1,129
Equity Securities [Member] | Level 3 [Member] | Equity Long/Short Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	801	[5]	842	[5]
Equity Securities [Member] | Level 3 [Member] | Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	249	[7]	287	[7]
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	12,011		10,305
Pension plans' actual assets allocation	42.00%		42.00%
Fixed Income Securities [Member] | Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10,273	[8]	8,650	[8]
Pension plans' actual assets allocation	36.00%	[8]	35.00%	[8]
Fixed Income Securities [Member] | Distressed Opportunity Ltd. Partnership [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	368	[9]	364	[9]
Pension plans' actual assets allocation	1.00%	[9]	2.00%	[9]
Fixed Income Securities [Member] | Multi-Strategy Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1,370	[10]	1,291	[10]
Pension plans' actual assets allocation	5.00%	[10]	5.00%	[10]
Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10,273		8,650
Fixed Income Securities [Member] | Level 2 [Member] | Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10,273	[8]	8,650	[8]
Fixed Income Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1,738		1,655
Fixed Income Securities [Member] | Level 3 [Member] | Distressed Opportunity Ltd. Partnership [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	368	[9]	364	[9]
Fixed Income Securities [Member] | Level 3 [Member] | Multi-Strategy Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 1,370	[10]	$ 1,291	[10]

[1] Investments in common stocks that rank among the largest 1,000 companies in the U.S. stock market.

[2] Investments in common stocks that rank among the small capitalization stocks in the U.S. stock market.

[3] Investments in common stocks across the world without being limited by national borders or to specific regions.

[4] Investments in common stocks of companies from developed and emerging countries outside the United States.

[5] Investments primarily in long and short positions in equity securities of U.S. and non-U.S. companies. The fund has semi-annual tender offer redemption periods on June 30 and December 31 and is reported on a one month lag.

[6] As of December 31, 2014, the pension plan was invested in real estate through a fund of funds which invests in global public real estate securities (REITs).

[7] Fund invests in portfolios of secondary interest in established venture capital, buyout, mezzanine and special situation funds on a global basis. Fund is valued on a quarterly lag with adjustment for subsequent cash activity.

[8] Investments in bonds representing many sectors of the broad bond market with both short-term and intermediate-term maturities.

[9] Investments mainly in discounted debt securities, bank loans, trade claims and other debt and equity securities of financially troubled companies. This partnership has semi-annual withdrawal rights on June 30 and December 31. This fund is reported on a one month lag.

[10] Investments mainly in partnerships that have multi-strategy investment programs and do not rely on a single investment model. One partnership has quarterly liquidation rights with notice of 65 days while the second partnership has monthly liquidation rights with notice of 33 days. Both funds are reported on a one month lag.