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Condensed consolidating financial information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operations: |  |  |
Cash provided by (used in) operating activities | $ (20,819) | $ 78,315 | $ (3,429)
Cash flows from investing activities |  |  |
Purchase of office facilities | (5,889) | (4,398) | (14,012)
Cash used in investing activities | (5,889) | (4,398) | (14,012)
Cash flows from financing activities |  |  |
Cash dividends paid on Class A non-voting and Class B voting common stock | (6,008) | (5,983) | (5,978)
Issuance of Class A non-voting common stock | 0 | 185 | 150
Repurchase of Class A non-voting common stock for cancellation | (8,250) | 0 | (3,625)
Tax (deficiency) benefit from share-based awards | (277) | 1,194 | (78)
Redemption of senior secured notes | 0 | (45,000) | 0
Increase in bank call loans, net | 40,800 | (58,800) | (10,100)
Cash provided by (used in) financing activities | 26,265 | (108,404) | (19,631)
Net decrease in cash and cash equivalents | (443) | (34,487) | (37,072)
Cash and cash equivalents, beginning of year | 63,807 | 98,294 | 135,366
Cash and cash equivalents, end of year | 63,364 | 63,807 | 98,294
Eliminations |  |  |
Cash flows from operations: |  |  |
Cash provided by (used in) operating activities | 0 | 0 | 0
Cash flows from investing activities |  |  |
Purchase of office facilities | 0 | 0 | 0
Cash used in investing activities | 0 | 0 | 0
Cash flows from financing activities |  |  |
Cash dividends paid on Class A non-voting and Class B voting common stock | 0 | 0 | 0
Issuance of Class A non-voting common stock |  | 0 | 0
Repurchase of Class A non-voting common stock for cancellation | 0 |  | 0
Tax (deficiency) benefit from share-based awards | 0 | 0 | 0
Redemption of senior secured notes |  | 0 |
Increase in bank call loans, net | 0 | 0 | 0
Cash provided by (used in) financing activities | 0 | 0 | 0
Net decrease in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents, beginning of year | 0 | 0 | 0
Cash and cash equivalents, end of year | 0 | 0 | 0
Parent | Reportable Legal Entities |  |  |
Cash flows from operations: |  |  |
Cash provided by (used in) operating activities | 15,003 | 49,595 | 9,944
Cash flows from investing activities |  |  |
Purchase of office facilities | 0 | 0 | 0
Cash used in investing activities | 0 | 0 | 0
Cash flows from financing activities |  |  |
Cash dividends paid on Class A non-voting and Class B voting common stock | (6,008) | (5,983) | (5,978)
Issuance of Class A non-voting common stock |  | 185 | 150
Repurchase of Class A non-voting common stock for cancellation | (8,250) |  | (3,625)
Tax (deficiency) benefit from share-based awards | (277) | 1,194 | (78)
Redemption of senior secured notes |  | (45,000) |
Increase in bank call loans, net |  | 0 | 0
Cash provided by (used in) financing activities | (14,535) | (49,604) | (9,531)
Net decrease in cash and cash equivalents | 468 | (9) | 413
Cash and cash equivalents, beginning of year | 439 | 448 | 35
Cash and cash equivalents, end of year | 907 | 439 | 448
Guarantor Subsidiaries | Reportable Legal Entities |  |  |
Cash flows from operations: |  |  |
Cash provided by (used in) operating activities | 1,029 | (29,344) | (9,757)
Cash flows from investing activities |  |  |
Purchase of office facilities | 0 | 0 | 0
Cash used in investing activities | 0 | 0 | 0
Cash flows from financing activities |  |  |
Cash dividends paid on Class A non-voting and Class B voting common stock | 0 | 0 | 0
Issuance of Class A non-voting common stock |  | 0 | 0
Repurchase of Class A non-voting common stock for cancellation | 0 |  | 0
Tax (deficiency) benefit from share-based awards | 0 | 0 | 0
Redemption of senior secured notes |  | 0 |
Increase in bank call loans, net | 0 | 0 | 0
Cash provided by (used in) financing activities | 0 | 0 | 0
Net decrease in cash and cash equivalents | 1,029 | (29,344) | (9,757)
Cash and cash equivalents, beginning of year | 1,557 | 30,901 | 40,658
Cash and cash equivalents, end of year | 2,586 | 1,557 | 30,901
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |
Cash flows from operations: |  |  |
Cash provided by (used in) operating activities | (36,851) | 58,064 | (3,616)
Cash flows from investing activities |  |  |
Purchase of office facilities | (5,889) | (4,398) | (14,012)
Cash used in investing activities | (5,889) | (4,398) | (14,012)
Cash flows from financing activities |  |  |
Cash dividends paid on Class A non-voting and Class B voting common stock | 0 | 0 | 0
Issuance of Class A non-voting common stock |  | 0 | 0
Repurchase of Class A non-voting common stock for cancellation | 0 |  | 0
Tax (deficiency) benefit from share-based awards | 0 | 0 | 0
Redemption of senior secured notes |  | 0 |
Increase in bank call loans, net | 40,800 | (58,800) | (10,100)
Cash provided by (used in) financing activities | 40,800 | (58,800) | (10,100)
Net decrease in cash and cash equivalents | (1,940) | (5,134) | (27,728)
Cash and cash equivalents, beginning of year | 61,811 | 66,945 | 94,673
Cash and cash equivalents, end of year | $ 59,871 | $ 61,811 | $ 66,945

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